diff --git a/mozilla/extensions/irc/js/lib/utils.js b/mozilla/extensions/irc/js/lib/utils.js
index 55fac652743..e588f507372 100644
--- a/mozilla/extensions/irc/js/lib/utils.js
+++ b/mozilla/extensions/irc/js/lib/utils.js
@@ -1441,7 +1441,7 @@ function strftime(format, time)
 
             if ("pad" in tbranch)
             {
-                var padwith = (padwith in tbranch) ? tbranch.padwith : "0";
+                var padwith = ("padwith" in tbranch) ? tbranch.padwith : "0";
                 rpl = padNumber(rpl, tbranch.pad, padwith);
             }
         }