diff --git a/lib/ace/edit_session.js b/lib/ace/edit_session.js
index 9845b61b..37bbe9b9 100644
--- a/lib/ace/edit_session.js
+++ b/lib/ace/edit_session.js
@@ -2405,7 +2405,8 @@ config.defineOptions(EditSession.prototype, "session", {
             this.$tabSize = tabSize;
             this._emit("changeTabSize");
         },
-        initialValue: 4
+        initialValue: 4,
+        handlesSet: true
     }
 });