diff --git a/src/privmsgs.py b/src/privmsgs.py
index d023c6fce..820d0a418 100644
--- a/src/privmsgs.py
+++ b/src/privmsgs.py
@@ -106,6 +106,7 @@ def getKeywordArgs(irc, msg, d=None):
             
 
 class CapabilityCheckingPrivmsg(callbacks.Privmsg):
+    self.capability = '' # To satisfy PyChecker
     def callCommand(self, f, irc, msg, args):
         if ircdb.checkCapability(msg.prefix, self.capability):
             callbacks.Privmsg.callCommand(self, f, irc, msg, args)