diff --git a/dlls/d3drm/tests/d3drm.c b/dlls/d3drm/tests/d3drm.c
index 91e1c76ecd6..36ae19d920c 100644
--- a/dlls/d3drm/tests/d3drm.c
+++ b/dlls/d3drm/tests/d3drm.c
@@ -613,7 +613,7 @@ static const GUID* refiids[] =
     &IID_IDirect3DRMFrame
 };
 
-void __cdecl object_load_callback(LPDIRECT3DRMOBJECT object, REFIID objectguid, LPVOID arg)
+static void __cdecl object_load_callback(LPDIRECT3DRMOBJECT object, REFIID objectguid, LPVOID arg)
 {
     ok(object != NULL, "Arg 1 should not be null\n");
     ok(IsEqualGUID(objectguid, refiids[nb_objects]), "Arg 2 should is incorrect\n");