diff --git a/core/src/main/kotlin/com/r3corda/core/contracts/Transactions.kt b/core/src/main/kotlin/com/r3corda/core/contracts/Transactions.kt
index da836c8476..03397d7542 100644
--- a/core/src/main/kotlin/com/r3corda/core/contracts/Transactions.kt
+++ b/core/src/main/kotlin/com/r3corda/core/contracts/Transactions.kt
@@ -163,7 +163,6 @@ data class SignedTransaction(val txBits: SerializedBytes<WireTransaction>,
      * Returns the set of missing signatures - a signature must be present for each signer public key.
      */
     private fun getMissingSignatures(): Set<PublicKey> {
-        val notaryKey = tx.notary?.owningKey
         val requiredKeys = tx.signers.toSet()
         val sigKeys = sigs.map { it.by }.toSet()