diff --git a/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_alert_types/threshold/lib/time_buckets/time_buckets.js b/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_alert_types/threshold/lib/time_buckets/time_buckets.js
index 000ad752da76e..fbf25d1d1d5dd 100644
--- a/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_alert_types/threshold/lib/time_buckets/time_buckets.js
+++ b/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_alert_types/threshold/lib/time_buckets/time_buckets.js
@@ -220,14 +220,14 @@ TimeBuckets.prototype.getInterval = function(useNormalizedEsInterval = true) {
   function readInterval() {
     const interval = self._i;
     if (moment.isDuration(interval)) return interval;
-    return calcAutoIntervalNear(this.uiSettings.get('histogram:barTarget'), Number(duration));
+    return calcAutoIntervalNear(self.uiSettings.get('histogram:barTarget'), Number(duration));
   }
 
   // check to see if the interval should be scaled, and scale it if so
   function maybeScaleInterval(interval) {
     if (!self.hasBounds()) return interval;
 
-    const maxLength = this.uiSettings.get('histogram:maxBars');
+    const maxLength = self.uiSettings.get('histogram:maxBars');
     const approxLen = duration / interval;
     let scaled;