diff --git a/hack/shelly.yaml b/hack/shelly.yaml
index d43c5dd..c9b28ad 100644
--- a/hack/shelly.yaml
+++ b/hack/shelly.yaml
@@ -5,8 +5,8 @@ mqtt:
   metric_per_topic_config:
     metric_name_regex: "shellies/(?P<deviceid>.*)/sensor/(?P<metricname>.*)"
   qos: 0
-  cache:
-    timeout: 24h
+cache:
+  timeout: 24h
 metrics:
   - prom_name: temperature
     # The name of the metric in a MQTT JSON message
@@ -40,4 +40,4 @@ metrics:
     # A map of string to string for constant labels. This labels will be attached to every prometheus metric
     const_labels:
       sensor_type: shelly
-    # The name of the metric in prometheus
\ No newline at end of file
+    # The name of the metric in prometheus
diff --git a/pkg/metrics/collector.go b/pkg/metrics/collector.go
index 7a41d87..0016839 100644
--- a/pkg/metrics/collector.go
+++ b/pkg/metrics/collector.go
@@ -9,8 +9,6 @@ import (
 	"time"
 )
 
-const DefaultTimeout = 0
-
 type Collector interface {
 	prometheus.Collector
 	Observe(deviceID string, collection MetricCollection)
@@ -32,7 +30,7 @@ type Metric struct {
 
 type CacheItem struct {
 	DeviceID string
-	Metric Metric
+	Metric   Metric
 }
 
 type MetricCollection []Metric
@@ -52,10 +50,10 @@ func NewCollector(defaultTimeout time.Duration, possibleMetrics []config.MetricC
 func (c *MemoryCachedCollector) Observe(deviceID string, collection MetricCollection) {
 	for _, m := range collection {
 		item := CacheItem{
-			DeviceID: deviceID, 
-			Metric: m,
+			DeviceID: deviceID,
+			Metric:   m,
 		}
-		c.cache.Set(fmt.Sprintf("%s-%s", deviceID, m.Description.String()), item, DefaultTimeout)
+		c.cache.Set(fmt.Sprintf("%s-%s", deviceID, m.Description.String()), item, gocache.DefaultExpiration)
 	}
 }