diff --git a/lib/src/packet/key/ecdh_session_key_params.dart b/lib/src/packet/key/ecdh_session_key_params.dart
index 02a0866f..9723317b 100644
--- a/lib/src/packet/key/ecdh_session_key_params.dart
+++ b/lib/src/packet/key/ecdh_session_key_params.dart
@@ -146,7 +146,7 @@ class ECDHSessionKeyParams extends SessionKeyParams {
           Uint8List.fromList(
             secretParams.d.toUnsignedBytes().reversed.toList(),
           ),
-          ephemeralKey.toUnsignedBytes(),
+          ephemeralKey.toUnsignedBytes().sublist(1),
         );
         break;
       case CurveInfo.ed25519: