diff --git a/dlls/ole32/compobj_private.h b/dlls/ole32/compobj_private.h
index 00024aba0fc..fc92389bd57 100644
--- a/dlls/ole32/compobj_private.h
+++ b/dlls/ole32/compobj_private.h
@@ -289,8 +289,8 @@ extern HRESULT WINAPI OLE32_DllGetClassObject(REFCLSID rclsid, REFIID iid,LPVOID
 extern HRESULT WINAPI OLE32_DllRegisterServer(void) DECLSPEC_HIDDEN;
 extern HRESULT WINAPI OLE32_DllUnregisterServer(void) DECLSPEC_HIDDEN;
 
-extern HRESULT Handler_DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv);
-extern HRESULT HandlerCF_Create(REFCLSID rclsid, REFIID riid, LPVOID *ppv);
+extern HRESULT Handler_DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv) DECLSPEC_HIDDEN;
+extern HRESULT HandlerCF_Create(REFCLSID rclsid, REFIID riid, LPVOID *ppv) DECLSPEC_HIDDEN;
 
 /* Exported non-interface Data Advise Holder functions */
 HRESULT DataAdviseHolder_OnConnect(IDataAdviseHolder *iface, IDataObject *pDelegate) DECLSPEC_HIDDEN;