2 files changed, 7 insertions, 4 deletions
diff --git a/src/encoding/hex/hex.go b/src/encoding/hex/hex.go
index 7675de9bd9..fbba78ffd2 100644
--- a/src/encoding/hex/hex.go
+++ b/src/encoding/hex/hex.go
@@ -23,11 +23,12 @@ func EncodedLen(n int) int { return n * 2 }
 // of bytes written to dst, but this value is always EncodedLen(len(src)).
 // Encode implements hexadecimal encoding.
 func Encode(dst, src []byte) int {
-	for i, v := range src {
-		dst[i*2] = hextable[v>>4]
-		dst[i*2+1] = hextable[v&0x0f]
+	j := 0
+	for _, v := range src {
+		dst[j] = hextable[v>>4]
+		dst[j+1] = hextable[v&0x0f]
+		j += 2
 	}
-
 	return len(src) * 2
 }
 
diff --git a/src/encoding/hex/hex_test.go b/src/encoding/hex/hex_test.go
index ba703cf1c1..dbb00b94ca 100644
--- a/src/encoding/hex/hex_test.go
+++ b/src/encoding/hex/hex_test.go
@@ -242,6 +242,7 @@ func BenchmarkEncode(b *testing.B) {
 		sink = make([]byte, 2*size)
 
 		b.Run(fmt.Sprintf("%v", size), func(b *testing.B) {
+			b.SetBytes(int64(size))
 			for i := 0; i < b.N; i++ {
 				Encode(sink, src)
 			}
@@ -269,6 +270,7 @@ func BenchmarkDump(b *testing.B) {
 		sink = make([]byte, 2*size)
 
 		b.Run(fmt.Sprintf("%v", size), func(b *testing.B) {
+			b.SetBytes(int64(size))
 			for i := 0; i < b.N; i++ {
 				Dump(src)
 			}