diff --git a/themes/classic/messenger/messageBody.css b/themes/classic/messenger/messageBody.css
index f4372bde8239..8d19fb97a566 100644
--- a/themes/classic/messenger/messageBody.css
+++ b/themes/classic/messenger/messageBody.css
@@ -25,8 +25,6 @@
   == Styles for the body of a mail message.
   ======================================================================= */
 
-@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
-
 /* 
  * These are the style attributes for the XUL display.
  */