diff --git a/docs/source/tutorial-contract.rst b/docs/source/tutorial-contract.rst
index 154dfef8da..6a08946980 100644
--- a/docs/source/tutorial-contract.rst
+++ b/docs/source/tutorial-contract.rst
@@ -114,7 +114,7 @@ A state is a class that stores data that is checked by the contract. A commercia
           override val participants = listOf(owner)
 
           fun withoutOwner() = copy(owner = AnonymousParty(NullPublicKey))
-          override fun withNewOwner(newOwner: PublicKey) = Pair(Commands.Move(), copy(owner = newOwner))
+          override fun withNewOwner(newOwner: AbstractParty) = Pair(Commands.Move(), copy(owner = newOwner))
       }
 
    .. sourcecode:: java