wuapi: Register interfaces.
diff --git a/dlls/wuapi/wuapi.spec b/dlls/wuapi/wuapi.spec
index c534b4f..b16365d 100644
--- a/dlls/wuapi/wuapi.spec
+++ b/dlls/wuapi/wuapi.spec
@@ -1,4 +1,4 @@
 @ stdcall -private DllCanUnloadNow()
 @ stdcall -private DllGetClassObject(ptr ptr ptr)
-@ stub DllRegisterServer
-@ stub DllUnregisterServer
+@ stdcall -private DllRegisterServer()
+@ stdcall -private DllUnregisterServer()