diff --git a/irctest/server_tests/regressions.py b/irctest/server_tests/regressions.py
index bf9145c..1f11ff5 100644
--- a/irctest/server_tests/regressions.py
+++ b/irctest/server_tests/regressions.py
@@ -2,10 +2,13 @@
 Regression tests for bugs in `Ergo <https://ergo.chat/>`_.
 """
 
-import time
-
 from irctest import cases, runner
-from irctest.numerics import ERR_ERRONEUSNICKNAME, ERR_NICKNAMEINUSE, RPL_WELCOME
+from irctest.numerics import (
+    ERR_ERRONEUSNICKNAME,
+    ERR_NICKNAMEINUSE,
+    RPL_HELLO,
+    RPL_WELCOME,
+)
 from irctest.patma import ANYDICT
 
 
@@ -111,8 +114,7 @@ class RegressionsTestCase(cases.BaseServerTestCase):
         self.sendLine(1, "NICK *")
         self.sendLine(1, "USER u s e r")
         replies = {"NOTICE"}
-        time.sleep(2)  # give time to slow servers, like irc2 to reply
-        while replies == {"NOTICE"}:
+        while replies <= {"NOTICE", RPL_HELLO}:
             replies = set(msg.command for msg in self.getMessages(1, synchronize=False))
         self.assertIn(ERR_ERRONEUSNICKNAME, replies)
         self.assertNotIn(RPL_WELCOME, replies)