diff --git a/modules/nickserv.py b/modules/nickserv.py
index 8532b7f9..8e811c65 100644
--- a/modules/nickserv.py
+++ b/modules/nickserv.py
@@ -35,7 +35,7 @@ class Module(object):
         if event["subcommand"] == "NAK":
             event["server"].send_capability_end()
         elif event["subcommand"] == "ACK":
-            if not "sasl" in event["capability_list"]:
+            if not "sasl" in event["capabilities"]:
                 event["server"].send_capability_end()
             else:
                 event["server"].send_authenticate("PLAIN")