diff --git a/dlls/windowscodecs/tests/converter.c b/dlls/windowscodecs/tests/converter.c
index 9da82f1665b..fba7fc73ac7 100644
--- a/dlls/windowscodecs/tests/converter.c
+++ b/dlls/windowscodecs/tests/converter.c
@@ -45,6 +45,9 @@ typedef struct BitmapTestSrc {
     const bitmap_data *data;
 } BitmapTestSrc;
 
+extern HRESULT STDMETHODCALLTYPE IWICBitmapFrameEncode_WriteSource_Proxy(IWICBitmapFrameEncode* This,
+    IWICBitmapSource *pIBitmapSource, WICRect *prc);
+
 static BOOL near_equal(float a, float b)
 {
     return fabsf(a - b) < 0.001;
diff --git a/include/unknwn.idl b/include/unknwn.idl
index 78a2d9db181..7856a7f5047 100644
--- a/include/unknwn.idl
+++ b/include/unknwn.idl
@@ -46,6 +46,16 @@ interface IUnknown
   ULONG Release();
 }
 
+cpp_quote("HRESULT STDMETHODCALLTYPE IUnknown_QueryInterface_Proxy(IUnknown* This, REFIID riid, void **ppvObject);")
+cpp_quote("void __RPC_STUB IUnknown_QueryInterface_Stub(IRpcStubBuffer* This, IRpcChannelBuffer* pRpcChannelBuffer,")
+cpp_quote("     PRPC_MESSAGE pRpcMessage, DWORD* pdwStubPhase);")
+cpp_quote("ULONG STDMETHODCALLTYPE IUnknown_AddRef_Proxy(IUnknown* This);")
+cpp_quote("void __RPC_STUB IUnknown_AddRef_Stub(IRpcStubBuffer* This, IRpcChannelBuffer* pRpcChannelBuffer,")
+cpp_quote("     PRPC_MESSAGE pRpcMessage, DWORD* pdwStubPhase);")
+cpp_quote("ULONG STDMETHODCALLTYPE IUnknown_Release_Proxy(IUnknown* This);")
+cpp_quote("void __RPC_STUB IUnknown_Release_Stub(IRpcStubBuffer* This, IRpcChannelBuffer* pRpcChannelBuffer,")
+cpp_quote("     PRPC_MESSAGE pRpcMessage, DWORD* pdwStubPhase);")
+
 cpp_quote("#ifdef SAVE_WIDL_C_INLINE_WRAPPERS")
 cpp_quote("#define WIDL_C_INLINE_WRAPPERS")
 cpp_quote("#endif")
diff --git a/tools/widl/header.c b/tools/widl/header.c
index 7b971582db6..e48b488ae32 100644
--- a/tools/widl/header.c
+++ b/tools/widl/header.c
@@ -1172,7 +1172,7 @@ static void write_method_proto(FILE *header, const type_t *iface)
   {
     const var_t *func = stmt->u.var;
 
-    if (!is_local(func->attrs)) {
+    if (is_callas(func->attrs)) {
       const char *callconv = get_attrp(func->type->attrs, ATTR_CALLCONV);
       if (!callconv) callconv = "STDMETHODCALLTYPE";
       /* proxy prototype */