diff --git a/extensions/source/activex/main/SOActiveX.h b/extensions/source/activex/main/SOActiveX.h
index 1dc7102ecb1a..03a06a6d1ac8 100644
--- a/extensions/source/activex/main/SOActiveX.h
+++ b/extensions/source/activex/main/SOActiveX.h
@@ -141,6 +141,7 @@ public:
     HRESULT OnDrawAdvanced(ATL_DRAWINFO& di);
     HRESULT OnDraw(ATL_DRAWINFO& di);
 
+    HRESULT SetLayoutManagerProps();
     HRESULT CreateFrameOldWay( HWND hwnd, int width, int height );
     HRESULT GetUnoStruct( OLECHAR* sStructName, CComPtr<IDispatch>& pdispResult );
     HRESULT LoadURLToFrame();