diff --git a/dlls/mmdevapi/main.c b/dlls/mmdevapi/main.c
index e19f27dfe3d..447813f12fe 100644
--- a/dlls/mmdevapi/main.c
+++ b/dlls/mmdevapi/main.c
@@ -176,6 +176,8 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
             DisableThreadLibraryCalls(hinstDLL);
             break;
         case DLL_PROCESS_DETACH:
+            if(lpvReserved)
+                break;
             MMDevEnum_Free();
             break;
     }