diff --git a/app/assets/stylesheets/pages/commit.scss b/app/assets/stylesheets/pages/commit.scss
index e53d6fc6bdc..74be90b7737 100644
--- a/app/assets/stylesheets/pages/commit.scss
+++ b/app/assets/stylesheets/pages/commit.scss
@@ -90,6 +90,7 @@
   position: relative;
   font-family: $monospace_font;
   $left: 12px;
+  overflow: hidden; // Issue #13987
   .max-width-marker {
     width: 72ch;
     color: rgba(0, 0, 0, 0.0);