diff --git a/neo.UnitTests/Network/P2P/Payloads/UT_Witness.cs b/neo.UnitTests/Network/P2P/Payloads/UT_Witness.cs
index 9c8d249d62..79db03be5a 100644
--- a/neo.UnitTests/Network/P2P/Payloads/UT_Witness.cs
+++ b/neo.UnitTests/Network/P2P/Payloads/UT_Witness.cs
@@ -134,11 +134,11 @@ public void MaxSize_OK()
         [TestMethod]
         public void MaxSize_Error()
         {
-            var witness = PrepareDummyWitness(15);
+            var witness = PrepareDummyWitness(11);
 
             // Check max size
 
-            Assert.IsTrue(witness.Size > 1400);
+            Assert.IsTrue(witness.Size > 1024);
             Assert.ThrowsException<FormatException>(() => witness.ToArray().AsSerializable<Witness>());
         }
 
@@ -193,4 +193,4 @@ public void ToJson()
             Assert.AreEqual(json["verification"].AsString(), "202020");
         }
     }
-}
\ No newline at end of file
+}