diff --git a/tests/Neo.UnitTests/SmartContract/UT_InteropService.cs b/tests/Neo.UnitTests/SmartContract/UT_InteropService.cs
index 083f884636..12b49c91e3 100644
--- a/tests/Neo.UnitTests/SmartContract/UT_InteropService.cs
+++ b/tests/Neo.UnitTests/SmartContract/UT_InteropService.cs
@@ -311,7 +311,6 @@ public void TestRuntime_CheckWitness_Null_ScriptContainer()
             var engine = GetEngine();
 
             engine.CheckWitness(pubkey.EncodePoint(true)).Should().BeFalse();
-            engine.CheckWitness(pubkey.EncodePoint(true)).Should().BeFalse();
         }
 
         [TestMethod]