diff --git a/webassets/iframe_visavis.html b/webassets/iframe_visavis.html
index 924c6fc..9e8000a 100644
--- a/webassets/iframe_visavis.html
+++ b/webassets/iframe_visavis.html
@@ -94,7 +94,7 @@
 
     window.plot.on_fixel_checked = (checked) => {
         const link = window.plot.json_request();
-        visavis_plot.json_request( checked ? `${link}&fixel=1` : link.replace('&fixel=1', '') );
+        window.plot.json_request( checked ? `${link}&fixel=1` : link.replace('&fixel=1', '') );
     }
 
 })();