diff --git a/pkg/controller/podautoscaler/metrics/metrics_client.go b/pkg/controller/podautoscaler/metrics/metrics_client.go
index 12d22a8e32b..f566a4836ad 100644
--- a/pkg/controller/podautoscaler/metrics/metrics_client.go
+++ b/pkg/controller/podautoscaler/metrics/metrics_client.go
@@ -86,7 +86,7 @@ var averageFunction = func(metrics heapster.MetricResultList) (intAndFloat, int,
 var heapsterCpuUsageMetricDefinition = metricDefinition{"cpu-usage", averageFunction}
 
 func getHeapsterCustomMetricDefinition(metricName string) metricDefinition {
-	return metricDefinition{"CM:" + metricName, averageFunction}
+	return metricDefinition{"custom/" + metricName, averageFunction}
 }
 
 // NewHeapsterMetricsClient returns a new instance of Heapster-based implementation of MetricsClient interface.