diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4830665..878d4c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,9 @@
 ## 0.14.0 / unreleased
 
 * [ENHANCEMENT] Add metrics for mapping cache hits ([#280](https://github.com/prometheus/statsd_exporter/pull/280))
-* [CHANGE] Rename existing metric for mapping cache size ([#282](https://github.com/prometheus/statsd_exporter/pull/282))
+* [CHANGE] Rename existing metric for mapping cache size ([#282](https://github.com/prometheus/statsd_exporter/pull/282), [#284](https://github.com/prometheus/statsd_exporter/pull/284))
 
-The metric `statsd_exporter_cache_length` is now called `mapping_cache_length`.
+The metric `statsd_exporter_cache_length` is now called `statsd_metric_mapper_cache_length`.
 
 ## 0.13.0 / 2019-12-06
 
diff --git a/pkg/mapper/mapper_cache.go b/pkg/mapper/mapper_cache.go
index e499986..1452d65 100644
--- a/pkg/mapper/mapper_cache.go
+++ b/pkg/mapper/mapper_cache.go
@@ -21,20 +21,20 @@ import (
 var (
 	cacheLength = prometheus.NewGauge(
 		prometheus.GaugeOpts{
-			Name: "mapping_cache_length",
+			Name: "statsd_metric_mapper_cache_length",
 			Help: "The count of unique metrics currently cached.",
 		},
 	)
 	cacheGetsTotal = prometheus.NewCounter(
 		prometheus.CounterOpts{
-			Name: "mapping_cache_gets_total",
-			Help: "The count of total cache gets.",
+			Name: "statsd_metric_mapper_cache_gets_total",
+			Help: "The count of total metric cache gets.",
 		},
 	)
 	cacheHitsTotal = prometheus.NewCounter(
 		prometheus.CounterOpts{
-			Name: "mapping_cache_hits_total",
-			Help: "The count of total cache hits.",
+			Name: "statsd_metric_mapper_cache_hits_total",
+			Help: "The count of total metric cache hits.",
 		},
 	)
 )