diff --git a/contracts/src/main/kotlin/com/r3/corda/lib/tokens/contracts/NonFungibleTokenContract.kt b/contracts/src/main/kotlin/com/r3/corda/lib/tokens/contracts/NonFungibleTokenContract.kt
index 848c8902..dce11d56 100644
--- a/contracts/src/main/kotlin/com/r3/corda/lib/tokens/contracts/NonFungibleTokenContract.kt
+++ b/contracts/src/main/kotlin/com/r3/corda/lib/tokens/contracts/NonFungibleTokenContract.kt
@@ -12,7 +12,7 @@ import java.security.PublicKey
 /**
  * See kdoc for [FungibleTokenContract].
  */
-class NonFungibleTokenContract : AbstractTokenContract<NonFungibleToken>() {
+open class NonFungibleTokenContract : AbstractTokenContract<NonFungibleToken>() {
 
     override val accepts: Class<NonFungibleToken> get() = uncheckedCast(NonFungibleToken::class.java)
 
@@ -90,4 +90,4 @@ class NonFungibleTokenContract : AbstractTokenContract<NonFungibleToken>() {
             "Holders of redeemed states must be the signing parties."
         }
     }
-}
\ No newline at end of file
+}