diff --git a/include/shlobj.h b/include/shlobj.h
index a87620dc13c..a46395d577e 100644
--- a/include/shlobj.h
+++ b/include/shlobj.h
@@ -18,7 +18,7 @@
 /****************************************************************************
 *  DllGetClassObject
 */
-DWORD WINAPI SHELL32_DllGetClassObject(LPCLSID,REFIID,LPVOID*);
+DWORD WINAPI SHELL32_DllGetClassObject(REFCLSID,REFIID,LPVOID*);