diff --git a/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleControl.cs b/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleControl.cs
index c4aa8a794b2..2513fe9e963 100644
--- a/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleControl.cs
+++ b/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleControl.cs
@@ -3327,7 +3327,7 @@ private static HostException CreateHostException(
         internal static void MimicKeyPress(INPUT[] inputs)
         {
             Dbg.Assert(inputs != null && inputs.Length > 0, "inputs should not be null or empty");
-            var numberOfSuccessfulEvents = NativeMethods.SendInput((uint)inputs.Length, inputs, ClrFacade.SizeOf<INPUT>());
+            var numberOfSuccessfulEvents = NativeMethods.SendInput((uint)inputs.Length, inputs, Marshal.SizeOf<INPUT>());
 
             if (numberOfSuccessfulEvents == 0)
             {
diff --git a/src/Microsoft.PowerShell.LocalAccounts/LocalAccounts/Sam.cs b/src/Microsoft.PowerShell.LocalAccounts/LocalAccounts/Sam.cs
index 84fbacd96ee..044c38efac0 100644
--- a/src/Microsoft.PowerShell.LocalAccounts/LocalAccounts/Sam.cs
+++ b/src/Microsoft.PowerShell.LocalAccounts/LocalAccounts/Sam.cs
@@ -1065,7 +1065,7 @@ private void OpenHandles()
                 // Open the "BuiltIn" domain
                 SecurityIdentifier sid = new SecurityIdentifier("S-1-5-32");
                 byte[] bSid = new byte[sid.BinaryLength];
-                int size = ClrFacade.SizeOf<byte>() * bSid.Length;
+                int size = Marshal.SizeOf<byte>() * bSid.Length;
 
                 pSid = Marshal.AllocHGlobal(size);
 
@@ -2247,7 +2247,7 @@ private void SetUserData(IntPtr userHandle,
                     if ((which & SamApi.USER_ALL_USERACCOUNTCONTROL) != 0)
                         info.UserAccountControl = uac;
 
-                    buffer = Marshal.AllocHGlobal(ClrFacade.SizeOf<USER_ALL_INFORMATION>());
+                    buffer = Marshal.AllocHGlobal(Marshal.SizeOf<USER_ALL_INFORMATION>());
                     Marshal.StructureToPtr<USER_ALL_INFORMATION>(info, buffer, false);
 
                     status = SamApi.SamSetInformationUser(userHandle,
@@ -2389,7 +2389,7 @@ private void SetSamDacl(IntPtr objectHandle, RawAcl rawAcl)
 
                 // create a new security descriptor
                 var sd = new SECURITY_DESCRIPTOR() { Revision = 1 };
-                ipsd = Marshal.AllocHGlobal(ClrFacade.SizeOf<SECURITY_DESCRIPTOR>());
+                ipsd = Marshal.AllocHGlobal(Marshal.SizeOf<SECURITY_DESCRIPTOR>());
 
                 if (rawAcl != null && rawAcl.BinaryLength > 0)
                 {
diff --git a/src/System.Management.Automation/engine/COM/ComInvoker.cs b/src/System.Management.Automation/engine/COM/ComInvoker.cs
index 12ef2dca6ab..9aa2a6c8e9c 100644
--- a/src/System.Management.Automation/engine/COM/ComInvoker.cs
+++ b/src/System.Management.Automation/engine/COM/ComInvoker.cs
@@ -24,7 +24,7 @@ internal static class ComInvoker
         // Alias of GUID_NULL. It's a GUID set to all zero
         private static readonly Guid s_IID_NULL = new Guid();
         // Size of the Variant struct
-        private static readonly int s_variantSize = ClrFacade.SizeOf<Variant>();
+        private static readonly int s_variantSize = Marshal.SizeOf<Variant>();
 
         /// <summary>
         /// Make a by-Ref VARIANT value based on the passed-in VARIANT argument
diff --git a/src/System.Management.Automation/engine/COM/ComUtil.cs b/src/System.Management.Automation/engine/COM/ComUtil.cs
index d87429a6d91..0fe5841ce28 100644
--- a/src/System.Management.Automation/engine/COM/ComUtil.cs
+++ b/src/System.Management.Automation/engine/COM/ComUtil.cs
@@ -49,7 +49,7 @@ internal static string GetMethodSignatureFromFuncDesc(COM.ITypeInfo typeinfo, CO
             builder.Append(" (");
 
             IntPtr ElementDescriptionArrayPtr = funcdesc.lprgelemdescParam;
-            int ElementDescriptionSize = ClrFacade.SizeOf<COM.ELEMDESC>();
+            int ElementDescriptionSize = Marshal.SizeOf<COM.ELEMDESC>();
 
             for (int i = 0; i < funcdesc.cParams; i++)
             {
@@ -288,7 +288,7 @@ internal static ParameterInformation[] GetParameterInformation(COM.FUNCDESC func
             ParameterInformation[] parameters = new ParameterInformation[cParams];
 
             IntPtr ElementDescriptionArrayPtr = funcdesc.lprgelemdescParam;
-            int ElementDescriptionSize = ClrFacade.SizeOf<COM.ELEMDESC>();
+            int ElementDescriptionSize = Marshal.SizeOf<COM.ELEMDESC>();
 
             for (int i = 0; i < cParams; i++)
             {
diff --git a/src/System.Management.Automation/engine/CommandCompletion/CompletionCompleters.cs b/src/System.Management.Automation/engine/CommandCompletion/CompletionCompleters.cs
index 6ce9ab17503..fb6e8913699 100644
--- a/src/System.Management.Automation/engine/CommandCompletion/CompletionCompleters.cs
+++ b/src/System.Management.Automation/engine/CommandCompletion/CompletionCompleters.cs
@@ -4468,7 +4468,7 @@ internal static List<string> GetFileShares(string machine, bool ignoreHidden)
             {
                 for (int i = 0; i < numEntries; ++i)
                 {
-                    IntPtr curInfoPtr = (IntPtr)((long)shBuf + (ClrFacade.SizeOf<SHARE_INFO_1>() * i));
+                    IntPtr curInfoPtr = (IntPtr)((long)shBuf + (Marshal.SizeOf<SHARE_INFO_1>() * i));
                     SHARE_INFO_1 shareInfo = ClrFacade.PtrToStructure<SHARE_INFO_1>(curInfoPtr);
 
 
diff --git a/src/System.Management.Automation/engine/remoting/fanin/WSManNativeAPI.cs b/src/System.Management.Automation/engine/remoting/fanin/WSManNativeAPI.cs
index 9b0e3afe1a1..44fda4966e0 100644
--- a/src/System.Management.Automation/engine/remoting/fanin/WSManNativeAPI.cs
+++ b/src/System.Management.Automation/engine/remoting/fanin/WSManNativeAPI.cs
@@ -176,7 +176,7 @@ internal MarshalledObject(IntPtr dataPtr)
             /// <returns>MarshalledObject</returns>
             internal static MarshalledObject Create<T>(T obj)
             {
-                IntPtr ptr = Marshal.AllocHGlobal(ClrFacade.SizeOf<T>());
+                IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf<T>());
                 Marshal.StructureToPtr(obj, ptr, false);
 
                 // Now create the MarshalledObject and return.
@@ -665,7 +665,7 @@ internal WSManData_ManToUn(byte[] data)
                 _marshalledBuffer = dataToSendPtr; // Stored directly to enable graceful clean up during finalizer scenarios
 
                 Marshal.Copy(data, 0, _internalData.binaryOrTextData.data, _internalData.binaryOrTextData.bufferLength);
-                _marshalledObject = Marshal.AllocHGlobal(ClrFacade.SizeOf<WSManDataStruct>());
+                _marshalledObject = Marshal.AllocHGlobal(Marshal.SizeOf<WSManDataStruct>());
                 Marshal.StructureToPtr(_internalData, _marshalledObject, false);
             }
 
@@ -686,7 +686,7 @@ internal WSManData_ManToUn(string data)
                 // marshal text data
                 _internalData.binaryOrTextData.data = Marshal.StringToHGlobalUni(data);
                 _marshalledBuffer = _internalData.binaryOrTextData.data; // Stored directly to enable graceful clean up during finalizer scenarios
-                _marshalledObject = Marshal.AllocHGlobal(ClrFacade.SizeOf<WSManDataStruct>());
+                _marshalledObject = Marshal.AllocHGlobal(Marshal.SizeOf<WSManDataStruct>());
                 Marshal.StructureToPtr(_internalData, _marshalledObject, false);
             }
 
@@ -945,7 +945,7 @@ internal WSManStreamIDSet_ManToUn(string[] streamIds)
             {
                 Dbg.Assert(streamIds != null, "stream ids cannot be null or empty");
 
-                int sizeOfIntPtr = ClrFacade.SizeOf<IntPtr>();
+                int sizeOfIntPtr = Marshal.SizeOf<IntPtr>();
                 _streamSetInfo = new WSManStreamIDSetStruct();
                 _streamSetInfo.streamIDsCount = streamIds.Length;
                 _streamSetInfo.streamIDs = Marshal.AllocHGlobal(sizeOfIntPtr * streamIds.Length);
@@ -965,7 +965,7 @@ internal void Dispose()
             {
                 if (IntPtr.Zero != _streamSetInfo.streamIDs)
                 {
-                    int sizeOfIntPtr = ClrFacade.SizeOf<IntPtr>();
+                    int sizeOfIntPtr = Marshal.SizeOf<IntPtr>();
                     for (int index = 0; index < _streamSetInfo.streamIDsCount; index++)
                     {
                         IntPtr streamAddress = IntPtr.Zero;
@@ -1028,7 +1028,7 @@ internal static WSManStreamIDSet_UnToMan UnMarshal(IntPtr unmanagedData)
                         /*
                          * // TODO: Why didn't this work? It looks more efficient
                         idsArray = new string[resultInternal.streamIDsCount];
-                        int sizeInBytes = ClrFacade.SizeOf<IntPtr>();
+                        int sizeInBytes = Marshal.SizeOf<IntPtr>();
                         IntPtr perElementPtr = resultInternal.streamIDs;
 
                         for (int i = 0; i < resultInternal.streamIDsCount; i++)
@@ -1103,7 +1103,7 @@ internal WSManOptionSet(WSManOption[] options)
             {
                 Dbg.Assert(null != options, "options cannot be null");
 
-                int sizeOfOption = ClrFacade.SizeOf<WSManOption>();
+                int sizeOfOption = Marshal.SizeOf<WSManOption>();
                 _optionSet = new WSManOptionSetStruct();
                 _optionSet.optionsCount = options.Length;
                 _optionSet.optionsMustUnderstand = true;
@@ -1187,7 +1187,7 @@ internal static WSManOptionSet UnMarshal(WSManOptionSetStruct resultInternal)
                 {
                     tempOptions = new WSManOption[resultInternal.optionsCount];
 
-                    int sizeInBytes = ClrFacade.SizeOf<WSManOption>();
+                    int sizeInBytes = Marshal.SizeOf<WSManOption>();
                     IntPtr perElementPtr = resultInternal.options;
 
                     for (int i = 0; i < resultInternal.optionsCount; i++)
@@ -1230,7 +1230,7 @@ internal WSManCommandArgSet(byte[] firstArgument)
             {
                 _internalData = new WSManCommandArgSetInternal();
                 _internalData.argsCount = 1;
-                _internalData.args = Marshal.AllocHGlobal(ClrFacade.SizeOf<IntPtr>());
+                _internalData.args = Marshal.AllocHGlobal(Marshal.SizeOf<IntPtr>());
 
                 // argument set takes only strings..but powershell's serialized pipeline might contain
                 // \0 (null characters) which are unacceptable in WSMan. So we are converting to Base64
@@ -1518,7 +1518,7 @@ internal static WSManEnvironmentVariableSet UnMarshal(IntPtr unmanagedData)
                     if (resultInternal.varsCount > 0)
                     {
                         varsArray = new WSManEnvironmentVariableInternal[resultInternal.varsCount];
-                        int sizeInBytes = ClrFacade.SizeOf<WSManEnvironmentVariableInternal>();
+                        int sizeInBytes = Marshal.SizeOf<WSManEnvironmentVariableInternal>();
                         IntPtr perElementPtr = resultInternal.vars;
 
                         for (int i = 0; i < resultInternal.varsCount; i++)
@@ -2251,7 +2251,7 @@ internal static WSManSelectorSet UnMarshal(WSManSelectorSetStruct resultInternal
                 if (resultInternal.numberKeys > 0)
                 {
                     tempKeys = new WSManKeyStruct[resultInternal.numberKeys];
-                    int sizeInBytes = ClrFacade.SizeOf<WSManKeyStruct>();
+                    int sizeInBytes = Marshal.SizeOf<WSManKeyStruct>();
                     IntPtr perElementPtr = resultInternal.keys;
 
                     for (int i = 0; i < resultInternal.numberKeys; i++)
diff --git a/src/System.Management.Automation/namespaces/FileSystemProvider.cs b/src/System.Management.Automation/namespaces/FileSystemProvider.cs
index d4c9a31dcc5..83509bb4b8a 100644
--- a/src/System.Management.Automation/namespaces/FileSystemProvider.cs
+++ b/src/System.Management.Automation/namespaces/FileSystemProvider.cs
@@ -8144,7 +8144,7 @@ private static string WinInternalGetLinkType(string filePath)
 
             using (SafeFileHandle handle = OpenReparsePoint(filePath, FileDesiredAccess.GenericRead))
             {
-                int outBufferSize = ClrFacade.SizeOf<REPARSE_DATA_BUFFER_SYMBOLICLINK>();
+                int outBufferSize = Marshal.SizeOf<REPARSE_DATA_BUFFER_SYMBOLICLINK>();
 
                 IntPtr outBuffer = Marshal.AllocHGlobal(outBufferSize);
                 bool success = false;
@@ -8378,7 +8378,7 @@ private static string InternalGetTarget(SafeFileHandle handle)
         [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2001:AvoidCallingProblematicMethods")]
         private static string WinInternalGetTarget(SafeFileHandle handle)
         {
-            int outBufferSize = ClrFacade.SizeOf<REPARSE_DATA_BUFFER_SYMBOLICLINK>();
+            int outBufferSize = Marshal.SizeOf<REPARSE_DATA_BUFFER_SYMBOLICLINK>();
 
             IntPtr outBuffer = Marshal.AllocHGlobal(outBufferSize);
             bool success = false;
@@ -8546,7 +8546,7 @@ internal static bool DeleteJunction(string junctionPath)
                 using (SafeHandle handle = OpenReparsePoint(junctionPath, FileDesiredAccess.GenericWrite))
                 {
                     bool success = false;
-                    int inOutBufferSize = ClrFacade.SizeOf<REPARSE_GUID_DATA_BUFFER>();
+                    int inOutBufferSize = Marshal.SizeOf<REPARSE_GUID_DATA_BUFFER>();
                     IntPtr outBuffer = Marshal.AllocHGlobal(inOutBufferSize);
                     IntPtr inBuffer = Marshal.AllocHGlobal(inOutBufferSize);
 
diff --git a/src/System.Management.Automation/utils/ClrFacade.cs b/src/System.Management.Automation/utils/ClrFacade.cs
index 80026085a3e..a8c50f52490 100644
--- a/src/System.Management.Automation/utils/ClrFacade.cs
+++ b/src/System.Management.Automation/utils/ClrFacade.cs
@@ -69,15 +69,6 @@ internal static SafeHandle GetSafeProcessHandle(Process process)
 
         #region Marshal
 
-        /// <summary>
-        /// Facade for Marshal.SizeOf
-        /// </summary>
-        internal static int SizeOf<T>()
-        {
-            // Marshal.SizeOf(Type) is obsolete in CoreCLR
-            return Marshal.SizeOf<T>();
-        }
-
         /// <summary>
         /// Facade for Marshal.PtrToStructure
         /// </summary>
diff --git a/src/System.Management.Automation/utils/PlatformInvokes.cs b/src/System.Management.Automation/utils/PlatformInvokes.cs
index 701770bf38c..d29b2ee1b55 100644
--- a/src/System.Management.Automation/utils/PlatformInvokes.cs
+++ b/src/System.Management.Automation/utils/PlatformInvokes.cs
@@ -337,7 +337,7 @@ internal static bool EnableTokenPrivilege(string privilegeName, ref TOKEN_PRIVIL
                             // The specified privilege is not enabled yet. Enable it.
                             newPrivilegeState.PrivilegeCount = 1;
                             newPrivilegeState.Privilege.Attributes = SE_PRIVILEGE_ENABLED;
-                            int bufferSize = ClrFacade.SizeOf<TOKEN_PRIVILEGE>();
+                            int bufferSize = Marshal.SizeOf<TOKEN_PRIVILEGE>();
                             int returnSize = 0;
 
                             // enable the specified privilege
@@ -406,7 +406,7 @@ internal static bool RestoreTokenPrivilege(string privilegeName, ref TOKEN_PRIVI
                     IntPtr tokenHandler = IntPtr.Zero;
                     if (OpenProcessToken(processHandler, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, out tokenHandler))
                     {
-                        int bufferSize = ClrFacade.SizeOf<TOKEN_PRIVILEGE>();
+                        int bufferSize = Marshal.SizeOf<TOKEN_PRIVILEGE>();
                         int returnSize = 0;
 
                         // restore the privilege state back to the previous privilege state