diff --git a/gjkr/protocol.go b/gjkr/protocol.go
index b2e5ec8..d83f212 100644
--- a/gjkr/protocol.go
+++ b/gjkr/protocol.go
@@ -38,6 +38,7 @@ func (m *ephemeralKeyPairGeneratingMember) generateEphemeralKeyPair() (
 
 	return &ephemeralPublicKeyMessage{
 		senderIndex:         m.memberIndex,
+		sessionID:           m.sessionID,
 		ephemeralPublicKeys: ephemeralKeys,
 	}, nil
 }