diff --git a/libs/p2p-crypto/src/main/kotlin/net/corda/p2p/crypto/protocol/api/AuthenticatedEncryptionSession.kt b/libs/p2p-crypto/src/main/kotlin/net/corda/p2p/crypto/protocol/api/AuthenticatedEncryptionSession.kt
index db42e135f28..0e6cb77fa42 100644
--- a/libs/p2p-crypto/src/main/kotlin/net/corda/p2p/crypto/protocol/api/AuthenticatedEncryptionSession.kt
+++ b/libs/p2p-crypto/src/main/kotlin/net/corda/p2p/crypto/protocol/api/AuthenticatedEncryptionSession.kt
@@ -34,7 +34,7 @@ class AuthenticatedEncryptionSession(override val sessionId: String,
                                      private val outboundNonce: ByteArray,
                                      private val inboundSecretKey: SecretKey,
                                      private val inboundNonce: ByteArray,
-                                     val maxMessageSize: Int): Session, SerialisableSessionData {
+                                     val maxMessageSize: Int): Session {
 
     private val provider = BouncyCastleProvider.PROVIDER_NAME
     private val encryptionCipher = Cipher.getInstance(CIPHER_ALGO, provider)
diff --git a/libs/p2p-crypto/src/main/kotlin/net/corda/p2p/crypto/protocol/api/AuthenticatedSession.kt b/libs/p2p-crypto/src/main/kotlin/net/corda/p2p/crypto/protocol/api/AuthenticatedSession.kt
index f7ef41c3700..3e75e52422e 100644
--- a/libs/p2p-crypto/src/main/kotlin/net/corda/p2p/crypto/protocol/api/AuthenticatedSession.kt
+++ b/libs/p2p-crypto/src/main/kotlin/net/corda/p2p/crypto/protocol/api/AuthenticatedSession.kt
@@ -24,7 +24,7 @@ import kotlin.concurrent.withLock
 class AuthenticatedSession(override val sessionId: String,
                            private val outboundSecretKey: SecretKey,
                            private val inboundSecretKey: SecretKey,
-                           val maxMessageSize: Int): Session, SerialisableSessionData {
+                           val maxMessageSize: Int): Session {
 
     private val provider = BouncyCastleProvider.PROVIDER_NAME
     private val generationHMac = Mac.getInstance(HMAC_ALGO, provider).apply {