diff --git a/programs/reg/tests/reg.c b/programs/reg/tests/reg.c
index 1958be0bc3..a813de1728 100644
--- a/programs/reg/tests/reg.c
+++ b/programs/reg/tests/reg.c
@@ -355,6 +355,9 @@ static void test_add(void)
     run_reg_exe("reg add HKCU\\" KEY_BASE " /v multi12 /t REG_MULTI_SZ /f /d", &r);
     ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
 
+    run_reg_exe("reg add HKCU\\" KEY_BASE " /v multi13 /t REG_MULTI_SZ /f /s", &r);
+    ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
+
     RegCloseKey(hkey);
 
     err = RegDeleteKeyA(HKEY_CURRENT_USER, KEY_BASE);