diff --git a/src/js/tabs/auxiliary.js b/src/js/tabs/auxiliary.js
index 359502f5..4c94e21f 100644
--- a/src/js/tabs/auxiliary.js
+++ b/src/js/tabs/auxiliary.js
@@ -409,16 +409,16 @@ TABS.auxiliary.initialize = function (callback) {
             }
             return channelPosition;
         }
-        
+
         function update_marker(auxChannelIndex, channelPosition) {
-            var percentage = (channelPosition - 900) / (2100-900) * 100;
-            
+            const percentage = (channelPosition - 900) / (2100-900) * 100;
+
             $('.modes .ranges .range').each( function () {
-                var auxChannelCandidateIndex = $(this).find('.channel').val();
-                if (auxChannelCandidateIndex != auxChannelIndex) {
+                const auxChannelCandidateIndex = parseInt($(this).find('.channel').val());
+                if (auxChannelCandidateIndex !== auxChannelIndex) {
                     return;
                 }
-                
+
                 $(this).find('.marker').css('left', percentage + '%');
             });
         }