diff --git a/dlls/qcap/dllsetup.c b/dlls/qcap/dllsetup.c
index 15dbe16a922..cd639941db9 100644
--- a/dlls/qcap/dllsetup.c
+++ b/dlls/qcap/dllsetup.c
@@ -289,7 +289,7 @@ HRESULT SetupRegisterServers(const CFactoryTemplate * pList, int num,
     /* next, register/unregister all filters */
     if (SUCCEEDED(hr))
     {
-        hr = CoInitialize((LPVOID)NULL);
+        hr = CoInitialize(NULL);
 
         TRACE("Getting IFilterMapper2\r\n");
         hr = CoCreateInstance(&CLSID_FilterMapper2, NULL, CLSCTX_INPROC_SERVER,