diff --git a/src/pkg/bytes/bytes.go b/src/pkg/bytes/bytes.go
index f7f2f03cd7b..56306b0288f 100644
--- a/src/pkg/bytes/bytes.go
+++ b/src/pkg/bytes/bytes.go
@@ -89,7 +89,7 @@ func Count(s, sep []byte) int {
 }
 
 // Contains returns whether subslice is within b.
-func Contains(b, subslice []string) bool {
+func Contains(b, subslice []byte) bool {
 	return Index(b, subslice) != -1
 }