diff --git a/prometheus/value.go b/prometheus/value.go
index 7d3e810..ff75ce5 100644
--- a/prometheus/value.go
+++ b/prometheus/value.go
@@ -44,7 +44,7 @@ var errInconsistentCardinality = errors.New("inconsistent label cardinality")
 // ValueType. This is a low-level building block used by the library to back the
 // implementations of Counter, Gauge, and Untyped.
 type value struct {
-	// valBits containst the bits of the represented float64 value. It has
+	// valBits contains the bits of the represented float64 value. It has
 	// to go first in the struct to guarantee alignment for atomic
 	// operations.  http://golang.org/pkg/sync/atomic/#pkg-note-BUG
 	valBits uint64