diff --git a/web/assets/codemirror/codemirror.js b/web/assets/codemirror/codemirror.js
index 034ea2f8..a3cd26c1 100644
--- a/web/assets/codemirror/codemirror.js
+++ b/web/assets/codemirror/codemirror.js
@@ -538,7 +538,7 @@
 
   var on = function(emitter, type, f) {
     if (emitter.addEventListener) {
-      emitter.addEventListener(type, f, { passive: true });
+      emitter.addEventListener(type, f, { passive: false });
     } else if (emitter.attachEvent) {
       emitter.attachEvent("on" + type, f);
     } else {