diff --git a/themes/base/ui.dialog.css b/themes/base/ui.dialog.css
index 45b80d0a4..9cd6d35d1 100644
--- a/themes/base/ui.dialog.css
+++ b/themes/base/ui.dialog.css
@@ -1,6 +1,6 @@
 /* Dialog
 ----------------------------------*/
-.ui-dialog {position: relative; padding: .2em; }
+.ui-dialog {position: relative; padding: .2em; width: 300px; }
 .ui-dialog-titlebar { padding: .5em .3em .3em 1em;  }
 .ui-dialog-title { float: left; margin: 2px 0; } 
 .ui-dialog-titlebar-close { float: right; width: 19px; margin: -.2em 0 0 0; padding: 1px; height: 18px; }