diff --git a/rhodecode/public/css/code-block.less b/rhodecode/public/css/code-block.less
--- a/rhodecode/public/css/code-block.less
+++ b/rhodecode/public/css/code-block.less
@@ -571,7 +571,7 @@ div.annotatediv { margin-left: 2px; marg
 .codehilite {
     .hll { background-color: #ffffcc }
     .c { color: #408080; font-style: italic } /* Comment */
-    .err, .codehilite .err { border: @border-thickness solid #FF0000 } /* Error */
+    .err, .codehilite .err { border: none } /* Error */
     .k { color: #008000; font-weight: bold } /* Keyword */
     .o { color: #666666 } /* Operator */
     .cm { color: #408080; font-style: italic } /* Comment.Multiline */