diff --git a/Changes.md b/Changes.md
index 50f2cee4..f4271e86 100644
--- a/Changes.md
+++ b/Changes.md
@@ -5,6 +5,8 @@
 HEAD
 ---------
 
+- **BREAK**: The Web UI has been refactored to remove jQuery. Any UI extensions
+  which use jQuery will break.
 - **FEATURE**: Sidekiq.logger has been enhanced so any `Rails.logger`
   output in jobs now shows up in the Sidekiq console. Remove any logger
   hacks in your initializer and see if it Just Works™ now. [#5021]
diff --git a/web/assets/javascripts/dashboard.js b/web/assets/javascripts/dashboard.js
index b056c685..79262af6 100644
--- a/web/assets/javascripts/dashboard.js
+++ b/web/assets/javascripts/dashboard.js
@@ -228,16 +228,6 @@ var pulseBeacon = function() {
   window.setTimeout(() => { document.getElementById('beacon').classList.remove('pulse'); }, 1000);
 }
 
-Number.prototype.numberWithDelimiter = function(delimiter) {
-  var number = this + '', delimiter = delimiter || ',';
-  var split = number.split('.');
-  split[0] = split[0].replace(
-      /(\d)(?=(\d\d\d)+(?!\d))/g,
-      '$1' + delimiter
-  );
-  return split.join('.');
-};
-
 // Render graphs
 var renderGraphs = function() {
   realtimeGraph();