diff --git a/exporter.go b/exporter.go
index c00a4a8..36b87b3 100644
--- a/exporter.go
+++ b/exporter.go
@@ -318,7 +318,7 @@ func (b *Exporter) Listen(e <-chan Events) {
 				}
 
 				switch t {
-				case "histogram":
+				case timerTypeHistogram:
 					histogram, err := b.Histograms.Get(
 						b.suffix(metricName, "timer"),
 						prometheusLabels,
diff --git a/mapper.go b/mapper.go
index 4d1e172..af861c4 100644
--- a/mapper.go
+++ b/mapper.go
@@ -128,13 +128,10 @@ func (m *metricMapper) initFromString(fileContents string) error {
 func (m *metricMapper) initFromYAMLString(fileContents string) error {
 	var n metricMapper
 
-	fmt.Println(fileContents)
-
 	if err := yaml.Unmarshal([]byte(fileContents), &n); err != nil {
 		return err
 	}
 
-	fmt.Printf("%#v\n", n)
 	if n.Defaults.Buckets == nil || len(n.Defaults.Buckets) == 0 {
 		n.Defaults.Buckets = prometheus.DefBuckets
 	}