diff --git a/src/Authoring/WinRT.SourceGenerator/WinRTTypeWriter.cs b/src/Authoring/WinRT.SourceGenerator/WinRTTypeWriter.cs
index c6f74e16c..d3c156299 100644
--- a/src/Authoring/WinRT.SourceGenerator/WinRTTypeWriter.cs
+++ b/src/Authoring/WinRT.SourceGenerator/WinRTTypeWriter.cs
@@ -1561,6 +1561,10 @@ private void AddOverloadAttributeForInterfaceMethods(TypeDeclaration interfaceTy
                         continue;
                     }
 
+                    bool alreadyHasOverload = method.TryGetAttributeWithType(Model.Compilation.GetTypeByMetadataName("Windows.Foundation.Metadata.OverloadAttribute"), out AttributeData _);
+                    if (alreadyHasOverload)
+                        continue;
+
                     string overloadedMethodName = methodName.Key + (++lastSuffix);
                     while (interfaceTypeDeclaration.MethodsByName.ContainsKey(overloadedMethodName))
                     {