diff --git a/dlls/advapi32/tests/registry.c b/dlls/advapi32/tests/registry.c
index 58c7202..c4f039a 100644
--- a/dlls/advapi32/tests/registry.c
+++ b/dlls/advapi32/tests/registry.c
@@ -437,7 +437,7 @@ static void create_test_entries(void)
         "RegSetValueExA failed\n");
     ok(!RegSetValueExA(hkey_main,"TP1_SZ",0,REG_SZ, (const BYTE *)sTestpath1, strlen(sTestpath1)+1), 
         "RegSetValueExA failed\n");
-    ok(!RegSetValueExA(hkey_main,"TP1_ZB_SZ",0,REG_SZ, NULL, 0),
+    ok(!RegSetValueExA(hkey_main,"TP1_ZB_SZ",0,REG_SZ, (const BYTE *)"", 0),
        "RegSetValueExA failed\n");
     ok(!RegSetValueExA(hkey_main,"TP2_EXP_SZ",0,REG_EXPAND_SZ, (const BYTE *)sTestpath2, strlen(sTestpath2)+1), 
         "RegSetValueExA failed\n");
-- 
1.5.4.3