diff --git a/modules/system/system.base.css b/modules/system/system.base.css
index 7e9220d..6b8b1aa 100644
--- a/modules/system/system.base.css
+++ b/modules/system/system.base.css
@@ -98,6 +98,9 @@ body.drag {
   margin-left: -1em; /* LTR */
   overflow: hidden;
   text-decoration: none;
+  -moz-box-sizing: content-box;
+  -webkit-box-sizing: content-box;
+  box-sizing: content-box;
 }
 a.tabledrag-handle:hover {
   text-decoration: none;