diff --git a/src/internal/binary/binary.go b/src/internal/binary/binary.go
index f3dbf6e9b..25f8d3963 100644
--- a/src/internal/binary/binary.go
+++ b/src/internal/binary/binary.go
@@ -30,3 +30,8 @@ func (littleEndian) AppendUint16(b []byte, v uint16) []byte {
 func (littleEndian) Uint32(b []byte) uint32 {
 	return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
 }
+
+func (littleEndian) Uint64(b []byte) uint64 {
+	return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
+		uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
+}
diff --git a/src/runtime/memhash_tsip.go b/src/runtime/memhash_tsip.go
index e05bf15dc..a8829e052 100644
--- a/src/runtime/memhash_tsip.go
+++ b/src/runtime/memhash_tsip.go
@@ -10,7 +10,7 @@
 package runtime
 
 import (
-	"encoding/binary"
+	"internal/binary"
 	"math/bits"
 	"unsafe"
 )