diff --git a/wp-content/themes/twentyten/editor-style.css b/wp-content/themes/twentyten/editor-style.css
index 9a61ad363..57a793872 100644
--- a/wp-content/themes/twentyten/editor-style.css
+++ b/wp-content/themes/twentyten/editor-style.css
@@ -1,5 +1,6 @@
-/* =Fonts
--------------------------------------------------------------- */
+html .mceContentBody {
+	max-width:640px;
+}
 * {
 	font-family: Georgia, "Bitstream Charter", serif;
 	color: #444;