diff --git a/src/bctklib/persistence/StateServiceStore.cs b/src/bctklib/persistence/StateServiceStore.cs
index cae398e..5a4ae55 100644
--- a/src/bctklib/persistence/StateServiceStore.cs
+++ b/src/bctklib/persistence/StateServiceStore.cs
@@ -126,7 +126,7 @@ static byte[] GetLedgerCurrentBlock(ICachingClient rpcClient, uint index)
             }
         }
 
-        public bool Contains(byte[] key) => TryGet(key) == null;
+        public bool Contains(byte[] key) => TryGet(key) != null;
 
         public IEnumerable<(byte[] Key, byte[] Value)> Seek(byte[] key, SeekDirection direction)
         {