diff --git a/lib/codemirror.css b/lib/codemirror.css
index ebfe4f697fe627f1ec9f2186def6a665d0bc0750..2d1a4d190338581ab1c79a264b503572a1b45b2f 100644
--- a/lib/codemirror.css
+++ b/lib/codemirror.css
@@ -245,6 +245,8 @@ div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #f22;}
   position: relative;
   overflow: visible;
   -webkit-tap-highlight-color: transparent;
+  -webkit-font-variant-ligatures: none;
+  font-variant-ligatures: none;
 }
 .CodeMirror-wrap pre {
   word-wrap: break-word;