diff --git a/irctest/server_tests/test_regressions.py b/irctest/server_tests/test_regressions.py
index 5591cec..613cff2 100644
--- a/irctest/server_tests/test_regressions.py
+++ b/irctest/server_tests/test_regressions.py
@@ -171,6 +171,5 @@ class RegressionsTestCase(cases.BaseServerTestCase):
         self.addClient(2)
         self.sendLine(2, "NICK alice")
         self.sendLine(2, "USER u s e r")
-        replies = set(msg.command for msg in self.getMessages(2))
-        self.assertNotIn(ERR_NICKNAMEINUSE, replies)
-        self.assertIn(RPL_WELCOME, replies)
+        reply = self.getRegistrationMessage(2)
+        self.assertMessageEqual(reply, command=RPL_WELCOME)