diff --git a/prometheus/metric.go b/prometheus/metric.go
index 6213ee8..76035bc 100644
--- a/prometheus/metric.go
+++ b/prometheus/metric.go
@@ -127,20 +127,6 @@ func (s LabelPairSorter) Less(i, j int) bool {
 	return s[i].GetName() < s[j].GetName()
 }
 
-type hashSorter []uint64
-
-func (s hashSorter) Len() int {
-	return len(s)
-}
-
-func (s hashSorter) Swap(i, j int) {
-	s[i], s[j] = s[j], s[i]
-}
-
-func (s hashSorter) Less(i, j int) bool {
-	return s[i] < s[j]
-}
-
 type invalidMetric struct {
 	desc *Desc
 	err  error