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
@@ -928,7 +928,7 @@ input.filediff-collapse-state {
             margin: @comment-padding;
         }
          /* hide add comment button when form is open */
-        .comment-inline-form-open + .cb-comment-add-button {
+        .comment-inline-form-open ~ .cb-comment-add-button {
             display: none;
         }
         .comment-inline-form-open {