diff --git a/src/web/js/beforePyret.js b/src/web/js/beforePyret.js
index 16f06d61..81d50606 100644
--- a/src/web/js/beforePyret.js
+++ b/src/web/js/beforePyret.js
@@ -290,7 +290,7 @@ $(function() {
         "Alt-Right": "goForwardSexp",
         "Ctrl-Left": "goBackwardToken",
         "Ctrl-Right": "goForwardToken",
-        [`${modifier}-/`]: "toggleComment",
+        [`${modifier}-/`]: function (cm) { cm.toggleComment({ "lineComment": "#" }); },
       }),
       indentUnit: 2,
       tabSize: 2,