diff --git a/app/test/test_bug551_DingZeYu.py b/app/test/test_bug551_DingZeYu.py
index 8fed439..42df637 100644
--- a/app/test/test_bug551_DingZeYu.py
+++ b/app/test/test_bug551_DingZeYu.py
@@ -13,7 +13,7 @@ def test_bug551():
     driver.maximize_window()
     driver.get("http://127.0.0.1:5000/")
 
-    username, password = signup(URL, driver)
+    username, password = signup("http://127.0.0.1:5000/", driver)
 
     article = driver.find_element(By.ID, 'article')
     actions = ActionChains(driver)