diff --git a/core/src/main/kotlin/net/corda/core/transactions/TransactionBuilder.kt b/core/src/main/kotlin/net/corda/core/transactions/TransactionBuilder.kt
index c05ee4b314..7f71dfefcf 100644
--- a/core/src/main/kotlin/net/corda/core/transactions/TransactionBuilder.kt
+++ b/core/src/main/kotlin/net/corda/core/transactions/TransactionBuilder.kt
@@ -68,7 +68,6 @@ open class TransactionBuilder(
     private companion object {
         private fun defaultLockId() = (Strand.currentStrand() as? FlowStateMachine<*>)?.id?.uuid ?: UUID.randomUUID()
         private val log = contextLogger()
-        private const val CORDA_VERSION_THAT_INTRODUCED_FLATTENED_COMMANDS = 4
 
         private val ID_PATTERN = "\\p{javaJavaIdentifierStart}\\p{javaJavaIdentifierPart}*"
         private val FQCP = Pattern.compile("$ID_PATTERN(/$ID_PATTERN)+")