diff --git a/dlls/quartz/tests/avisplitter.c b/dlls/quartz/tests/avisplitter.c
index f4c81578e5..33a0d6d24e 100644
--- a/dlls/quartz/tests/avisplitter.c
+++ b/dlls/quartz/tests/avisplitter.c
@@ -185,7 +185,7 @@ static const char afile[] = "test.avi";
  * By avoiding the filtergraph all together and connecting streams directly to
  * the null renderer I am sure that this is not the case here.
  */
-static void test_threads()
+static void test_threads(void)
 {
     IFileSourceFilter *pfile = NULL;
     IBaseFilter *preader = NULL, *pavi = NULL;