diff --git a/unmarshal.go b/unmarshal.go
index f29cd1f..5321d38 100644
--- a/unmarshal.go
+++ b/unmarshal.go
@@ -58,7 +58,7 @@ func UnmarshalUint16(in []byte) (ret uint16, n int, err error) {
 		return 0, 0, errors.New("ssob: Invalid input to decode uint16")
 	}
 
-	return binary.BigEndian.Uint16(in[0:1]), 2, nil
+	return binary.BigEndian.Uint16(in[0:2]), 2, nil
 }
 
 func UnmarshalInt32(in []byte) (ret int32, n int, err error) {