diff --git a/dlls/comctl32/tests/combo.c b/dlls/comctl32/tests/combo.c
index d2a812c5e20..ef7c3f796b5 100644
--- a/dlls/comctl32/tests/combo.c
+++ b/dlls/comctl32/tests/combo.c
@@ -1125,7 +1125,7 @@ static void test_combo_listbox_styles(DWORD cb_style)
     DestroyWindow(combo);
 }
 
-void test_combo_WS_VSCROLL(void)
+static void test_combo_WS_VSCROLL(void)
 {
     HWND hCombo, hList;
     COMBOBOXINFO info;