diff --git a/irctest/irc_utils/ambiguities.py b/irctest/irc_utils/ambiguities.py
index 42b9e2b..1b7b943 100644
--- a/irctest/irc_utils/ambiguities.py
+++ b/irctest/irc_utils/ambiguities.py
@@ -14,7 +14,7 @@ def normalize_namreply_params(params):
     # end of the nick list.
     if len(params) == 3:
         assert params[1][0] in "=*@", params
-        params.insert(1), params[1][0]
+        params.insert(1, params[1][0])
         params[2] = params[2][1:]
     params[3] = params[3].rstrip()
     return params