diff --git a/tests/test_double_serializer.c b/tests/test_double_serializer.c
index 773527a..bad7ef5 100644
--- a/tests/test_double_serializer.c
+++ b/tests/test_double_serializer.c
@@ -34,7 +34,8 @@ int main()
 	json_object_put(obj);
 	printf("Test no zero reset serializer:\n");
 	obj = json_object_new_double(3.1415000);
-	json_object_set_serializer(obj, json_object_double_to_json_string, "%.17g", NULL);
+	char data[] = "%.17g";
+	json_object_set_serializer(obj, json_object_double_to_json_string, data, NULL);
 	printf("obj.to_string(reset)=%s\n", json_object_to_json_string_ext(obj, 4));
 
 	json_object_put(obj);