diff --git a/src/AST/TypeExtensions.cs b/src/AST/TypeExtensions.cs
index 1b4d7bc6..7570dc45 100644
--- a/src/AST/TypeExtensions.cs
+++ b/src/AST/TypeExtensions.cs
@@ -114,7 +114,7 @@
 
         public static bool IsTagDecl<T>(this Type t, out T decl) where T : Declaration
         {
-            var tag = t as TagType;
+            var tag = t.Desugar() as TagType;
             
             if (tag == null)
             {
diff --git a/tests/Basic/Basic.h b/tests/Basic/Basic.h
index 490d7072..01860bf0 100644
--- a/tests/Basic/Basic.h
+++ b/tests/Basic/Basic.h
@@ -302,3 +302,13 @@ struct EmptyNamedNestedEnum
 {
     enum { Value = 10 };
 };
+
+
+typedef struct SomeStruct
+{
+}
+SomeStruct;
+
+class SomeClassExtendingTheStruct : public SomeStruct
+{
+};
\ No newline at end of file