diff --git a/lib/codemirror.css b/lib/codemirror.css
index 6b9ca0238da6acd1f9614198bc8c733853b53bcd..68c67b170ad17fcc41b1794babae5c6e353a2da1 100644
--- a/lib/codemirror.css
+++ b/lib/codemirror.css
@@ -87,7 +87,7 @@
 /* Can style cursor different in overwrite (non-insert) mode */
 div.CodeMirror-overwrite div.CodeMirror-cursor {}
 
-.cm-tab { display: inline-block; }
+.cm-tab { display: inline-block; text-decoration: inherit; }
 
 .CodeMirror-ruler {
   border-left: 1px solid #ccc;