diff --git a/src/Microsoft.PowerShell.Commands.Management/cimSupport/cmdletization/cim/ExtrinsicMethodInvocationJob.cs b/src/Microsoft.PowerShell.Commands.Management/cimSupport/cmdletization/cim/ExtrinsicMethodInvocationJob.cs
index 1194da4ab0f..9aa254212a6 100644
--- a/src/Microsoft.PowerShell.Commands.Management/cimSupport/cmdletization/cim/ExtrinsicMethodInvocationJob.cs
+++ b/src/Microsoft.PowerShell.Commands.Management/cimSupport/cmdletization/cim/ExtrinsicMethodInvocationJob.cs
@@ -105,7 +105,7 @@ private void OnNext(CimMethodResult methodResult)
 
             if (cmdletOutput.Count == 1)
             {
-                var singleOutputParameter = cmdletOutput.Values.Single();
+                var singleOutputParameter = cmdletOutput.Values.First();
                 if (singleOutputParameter.Value == null)
                 {
                     return;
diff --git a/src/Microsoft.PowerShell.Commands.Management/cimSupport/cmdletization/cim/clientSideQuery.cs b/src/Microsoft.PowerShell.Commands.Management/cimSupport/cmdletization/cim/clientSideQuery.cs
index aabb837042c..7ee599402a1 100644
--- a/src/Microsoft.PowerShell.Commands.Management/cimSupport/cmdletization/cim/clientSideQuery.cs
+++ b/src/Microsoft.PowerShell.Commands.Management/cimSupport/cmdletization/cim/clientSideQuery.cs
@@ -202,7 +202,7 @@ public CimInstanceRegularFilter(string propertyName, IEnumerable allowedProperty
 
                 if (valueBehaviors.Count == 1)
                 {
-                    this.BehaviorOnNoMatch = valueBehaviors.Single();
+                    this.BehaviorOnNoMatch = valueBehaviors.First();
                 }
                 else
                 {
diff --git a/src/System.Management.Automation/cimSupport/cmdletization/ScriptWriter.cs b/src/System.Management.Automation/cimSupport/cmdletization/ScriptWriter.cs
index 7d7f0a63b0f..b34c512e60a 100644
--- a/src/System.Management.Automation/cimSupport/cmdletization/ScriptWriter.cs
+++ b/src/System.Management.Automation/cimSupport/cmdletization/ScriptWriter.cs
@@ -1983,7 +1983,7 @@ private void WriteCmdlet(TextWriter output, InstanceCmdletMetadata instanceCmdle
             }
             else if (queryParameterSets.Count == 1)
             {
-                commandMetadata.DefaultParameterSetName = queryParameterSets.Single();
+                commandMetadata.DefaultParameterSetName = queryParameterSets[0];
             }
 
             AddPassThruParameter(commonParameters, instanceCmdlet);