diff --git a/dlls/rpcrt4/tests/cstub.c b/dlls/rpcrt4/tests/cstub.c
index 1438caa502b..3a4c7b49907 100644
--- a/dlls/rpcrt4/tests/cstub.c
+++ b/dlls/rpcrt4/tests/cstub.c
@@ -56,7 +56,7 @@ static void * CALLBACK my_alloc(size_t size)
 static void CALLBACK my_free(void *ptr)
 {
     my_free_called++;
-    return NdrOleFree(ptr);
+    NdrOleFree(ptr);
 }
 
 typedef struct _MIDL_PROC_FORMAT_STRING
diff --git a/dlls/rpcrt4/tests/ndr_marshall.c b/dlls/rpcrt4/tests/ndr_marshall.c
index 3d1a5d0c8d4..67ac5319ec2 100644
--- a/dlls/rpcrt4/tests/ndr_marshall.c
+++ b/dlls/rpcrt4/tests/ndr_marshall.c
@@ -42,7 +42,7 @@ void * CALLBACK my_alloc(size_t size)
 void CALLBACK my_free(void *ptr)
 {
     my_free_called++;
-    return NdrOleFree(ptr);
+    NdrOleFree(ptr);
 }
 
 static const MIDL_STUB_DESC Object_StubDesc =