diff --git a/irctest/server_tests/whois.py b/irctest/server_tests/whois.py
index 51b7ad9..b9c1b3c 100644
--- a/irctest/server_tests/whois.py
+++ b/irctest/server_tests/whois.py
@@ -56,6 +56,7 @@ class _WhoisTestMixin(cases.BaseServerTestCase):
                 [m.command for m in self.getMessages(1)],
                 fail_msg="OPER failed",
             )
+            self.getMessages(1)  # make sure we did get all oper-up messages
 
         self.sendLine(1, "WHOIS nick2")