diff --git a/rhodecode/public/css/diff.css b/rhodecode/public/css/diff.css
--- a/rhodecode/public/css/diff.css
+++ b/rhodecode/public/css/diff.css
@@ -135,7 +135,8 @@ cursor: pointer;
 	padding:0;
 	margin:0;
 }
-.line:hover{
+
+.diffblock.margined.comm .line:hover{
     background-color:#FFFFCC !important;
     cursor: pointer !important;
     background-image:url("../images/icons/comment_add.png") !important;