diff --git a/web/ui/static/js/prom_console.js b/web/ui/static/js/prom_console.js
index 2192c8b7e..c0f0b8464 100644
--- a/web/ui/static/js/prom_console.js
+++ b/web/ui/static/js/prom_console.js
@@ -523,6 +523,14 @@ PromConsole.Graph.prototype._clearGraph = function() {
 
 PromConsole.Graph.prototype._xhrs = [];
 
+PromConsole.Graph.prototype.buildQueryUrl = function(expr) {
+  var p = this.params;
+  return PATH_PREFIX + "/api/v1/query_range?query=" +
+    encodeURIComponent(expr) +
+    "&step=" + p.duration / this.graphTd.offsetWidth +
+    "&start=" + (p.endTime - p.duration) + "&end=" + p.endTime;
+};
+
 PromConsole.Graph.prototype.dispatch = function() {
   for (var j = 0; j < this._xhrs.length; j++) {
     this._xhrs[j].abort();
@@ -532,9 +540,7 @@ PromConsole.Graph.prototype.dispatch = function() {
   var pending_requests = this.params.expr.length;
   for (var i = 0; i < this.params.expr.length; ++i) {
     var endTime = this.params.endTime;
-    var url = PATH_PREFIX + "/api/v1/query_range?query=" + encodeURIComponent(this.params.expr[i]) +
-      "&step=" + this.params.duration / this.graphTd.offsetWidth + 
-      "&start=" + (endTime - this.params.duration) + "&end=" + endTime;
+    var url = this.buildQueryUrl(this.params.expr[i]);
     var xhr = new XMLHttpRequest();
     xhr.open('get', url, true);
     xhr.responseType = 'json';