diff --git a/mailnews/base/resources/content/mailWindowOverlay.xul b/mailnews/base/resources/content/mailWindowOverlay.xul
index 470be8752bc9..bfb22cb9ebe6 100644
--- a/mailnews/base/resources/content/mailWindowOverlay.xul
+++ b/mailnews/base/resources/content/mailWindowOverlay.xul
@@ -639,7 +639,7 @@ Rights Reserved.
accesskey="&showMessageCmd.accesskey;"
oncommand="MsgToggleMessagePane();"/>