diff --git a/web/script_2.js b/web/script_2.js
index 3dc9fb2..ff86963 100644
--- a/web/script_2.js
+++ b/web/script_2.js
@@ -274,7 +274,7 @@ if(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine
     isMobile = true;
 }
 
-val TOC_SCREEN_WIDTH_CUTOFF = 400
+var TOC_SCREEN_WIDTH_CUTOFF = 400
 
 if (isMobile && window.screen.width < TOC_SCREEN_WIDTH_CUTOFF) {
     $(`code:contains(ToC)`).html(TOC_MOBILE);