diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index fb6b7c1b867..c59737072d3 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -2619,6 +2619,12 @@ namespace {
                         scopeInfo = scopeInfo->addChild(ScopeInfo3::MemberFunction, scope, tok, tok->link());
                         added = true;
                     }
+                    // inline member function
+                    else if ((scopeInfo->type == ScopeInfo3::Record || scopeInfo->type == ScopeInfo3::Namespace) && tok1 && Token::Match(tok1->tokAt(-1), "%name% (")) {
+                        const std::string scope = scopeInfo->name + "::" + tok1->strAt(-1);
+                        scopeInfo = scopeInfo->addChild(ScopeInfo3::MemberFunction, scope, tok, tok->link());
+                        added = true;
+                    }
                 }
 
                 if (!added)
diff --git a/test/testsimplifyusing.cpp b/test/testsimplifyusing.cpp
index 0c0e52f0aea..32ce460db3e 100644
--- a/test/testsimplifyusing.cpp
+++ b/test/testsimplifyusing.cpp
@@ -72,6 +72,7 @@ class TestSimplifyUsing : public TestFixture {
         TEST_CASE(simplifyUsing30);
         TEST_CASE(simplifyUsing31);
         TEST_CASE(simplifyUsing32);
+        TEST_CASE(simplifyUsing33);
 
         TEST_CASE(simplifyUsing8970);
         TEST_CASE(simplifyUsing8971);
@@ -793,6 +794,25 @@ class TestSimplifyUsing : public TestFixture {
         ASSERT_EQUALS("", errout_str());
     }
 
+    void simplifyUsing33() { // #13090
+        const char code[] = "namespace N {\n"
+                            "    using T = int;\n"
+                            "    T f() { return (T)0; }\n"
+                            "}\n"
+                            "struct S {\n"
+                            "    using U = int;\n"
+                            "    U g() { return (U)0; }\n"
+                            "};\n";
+        const char expected[] = "namespace N { "
+                                "int f ( ) { return ( int ) 0 ; } "
+                                "} "
+                                "struct S { "
+                                "int g ( ) { return ( int ) 0 ; } "
+                                "} ;";
+        ASSERT_EQUALS(expected, tok(code, Platform::Type::Native, /*debugwarnings*/ true));
+        ASSERT_EQUALS("", errout_str());
+    }
+
     void simplifyUsing8970() {
         const char code[] = "using V = std::vector<int>;\n"
                             "struct A {\n"