diff --git a/tests/Neo.UnitTests/SmartContract/UT_KeyBuilder.cs b/tests/Neo.UnitTests/SmartContract/UT_KeyBuilder.cs
index 84caf06144..d03a411b4d 100644
--- a/tests/Neo.UnitTests/SmartContract/UT_KeyBuilder.cs
+++ b/tests/Neo.UnitTests/SmartContract/UT_KeyBuilder.cs
@@ -6,9 +6,9 @@ namespace Neo.UnitTests.SmartContract
     [TestClass]
     public class UT_KeyBuilder
     {
-        private struct A
+        private struct TestKey
         {
-            public int x;
+            public int Value;
         }
 
         [TestMethod]
@@ -28,11 +28,11 @@ public void Test()
             Assert.AreEqual("010000000203040000000000000000000000000000000000000000", key.ToArray().ToHexString());
 
             key = new KeyBuilder(1, 2);
-            key = key.Add(new A() { x = 123 });
+            key = key.Add(new TestKey { Value = 123 });
             Assert.AreEqual("01000000027b000000", key.ToArray().ToHexString());
 
             key = new KeyBuilder(1, 0);
-            key = key.AddBigEndian(new A() { x = 1 });
+            key = key.AddBigEndian(new TestKey { Value = 1 });
             Assert.AreEqual("010000000000000001", key.ToArray().ToHexString());
         }
     }