diff --git a/src/neo/SmartContract/Native/NonfungibleToken.cs b/src/neo/SmartContract/Native/NonfungibleToken.cs
index c572a3889d..fb1a560b67 100644
--- a/src/neo/SmartContract/Native/NonfungibleToken.cs
+++ b/src/neo/SmartContract/Native/NonfungibleToken.cs
@@ -123,14 +123,14 @@ public BigInteger BalanceOf(DataCache snapshot, UInt160 owner)
         }
 
         [ContractMethod(0_01000000, CallFlags.ReadStates)]
-        private IIterator Tokens(DataCache snapshot)
+        protected IIterator Tokens(DataCache snapshot)
         {
-            var results = snapshot.Find(new[] { Prefix_Token }).GetEnumerator();
+            var results = snapshot.Find(CreateStorageKey(Prefix_Token).ToArray()).GetEnumerator();
             return new StorageIterator(results, FindOptions.ValuesOnly | FindOptions.DeserializeValues | FindOptions.PickField1, null);
         }
 
         [ContractMethod(0_01000000, CallFlags.ReadStates)]
-        private IIterator TokensOf(DataCache snapshot, UInt160 owner)
+        protected IIterator TokensOf(DataCache snapshot, UInt160 owner)
         {
             NFTAccountState account = snapshot.TryGet(CreateStorageKey(Prefix_Account).Add(owner))?.GetInteroperable<NFTAccountState>();
             IReadOnlyList<byte[]> tokens = account?.Tokens ?? (IReadOnlyList<byte[]>)System.Array.Empty<byte[]>();