diff --git a/extensions/irc/xul/content/static.js b/extensions/irc/xul/content/static.js
index e5e7f0048d63..19d1ae138824 100644
--- a/extensions/irc/xul/content/static.js
+++ b/extensions/irc/xul/content/static.js
@@ -861,7 +861,7 @@ function insertChannelLink (matchText, containerTag, eventData)
 
 function insertBugzillaLink (matchText, containerTag, eventData)
 {
-    var idOrAlias = matchText.match(/bug\s+#?(\d{3,6}|[^\s,]{1,20})/)[1];
+    var idOrAlias = matchText.match(/bug\s+#?(\d{3,6}|[^\s,]{1,20})/i)[1];
 
     var anchor = document.createElementNS ("http://www.w3.org/1999/xhtml",
                                            "html:a");