diff --git a/toolkit/mozapps/shared/CertUtils.jsm b/toolkit/mozapps/shared/CertUtils.jsm
index 9f789526d5b..1ec22adf347 100644
--- a/toolkit/mozapps/shared/CertUtils.jsm
+++ b/toolkit/mozapps/shared/CertUtils.jsm
@@ -86,7 +86,9 @@ BadCertHandler.prototype = {
   onChannelRedirect: function(oldChannel, newChannel, flags) {
     // make sure the certificate of the old channel checks out before we follow
     // a redirect from it.  See bug 340198.
-    checkCert(oldChannel);
+    // Don't call checkCert for internal redirects. See bug 569648.
+    if (!(flags & Components.interfaces.nsIChannelEventSink.REDIRECT_INTERNAL))
+      checkCert(oldChannel);
   },
 
   // Suppress any certificate errors