diff --git a/dll/cpl/mmsys/mmsys.spec b/dll/cpl/mmsys/mmsys.spec
index bcdbd159e2a..ab2862ab288 100644
--- a/dll/cpl/mmsys/mmsys.spec
+++ b/dll/cpl/mmsys/mmsys.spec
@@ -4,8 +4,8 @@
 @ stdcall mmseRunOnceA(ptr ptr str long)
 @ stdcall ShowMMCPLPropertySheet(ptr str str str)
 @ stdcall ShowAudioPropertySheet(ptr ptr str long)
-@ stdcall DllCanUnloadNow()
-@ stdcall DllGetClassObject(ptr ptr ptr)
+@ stdcall -private DllCanUnloadNow()
+@ stdcall -private DllGetClassObject(ptr ptr ptr)
 @ stdcall ShowDriverSettingsAfterFork(ptr ptr str long)
 @ stdcall ShowDriverSettingsAfterForkW(ptr ptr wstr long)
 @ stdcall ShowDriverSettingsAfterForkA(ptr ptr str long)