diff --git a/docshell/resources/content/netError.xhtml b/docshell/resources/content/netError.xhtml
index ccee9cdd1dd..952300cdc56 100644
--- a/docshell/resources/content/netError.xhtml
+++ b/docshell/resources/content/netError.xhtml
@@ -58,7 +58,7 @@
   <head>
     <title>&loadError.label;</title>
     <link rel="stylesheet" href="chrome://global/skin/netError.css" type="text/css" media="all" />
-    <link rel="icon" type="image/png" id="favicon" href="data:image/png;base64,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"/>
+    <link rel="icon" type="image/png" id="favicon" href="chrome://global/skin/icons/warning-16.png"/>
 
     <script type="application/x-javascript"><![CDATA[
       // Error url MUST be formatted like this:
