diff --git a/scout/server/blueprints/variants/static/form_scripts.js b/scout/server/blueprints/variants/static/form_scripts.js
index 1b3234b26d..3393d3c743 100644
--- a/scout/server/blueprints/variants/static/form_scripts.js
+++ b/scout/server/blueprints/variants/static/form_scripts.js
@@ -3,7 +3,7 @@ function populateCytobands(cytobands){
   var chromPosPattern = new RegExp("^(?:chr)?([1-9]|1[0-9]|2[0-2]|X|Y|MT)$");
   var chrom = document.forms["filters_form"].elements["chrom"].value;
   var chromPos = "";
-  if (typeof document.forms["filters_form"].elements["chrom_pos"] != "undefined") {
+  if (typeof document.forms["filters_form"].elements["chrom_pos"] !== "undefined") {
   	chromPos=document.forms["filters_form"].elements["chrom_pos"].value;
 	}