diff --git a/Assets/Mirror/Tests/Editor/MessagePackerTest.cs b/Assets/Mirror/Tests/Editor/MessagePackerTest.cs
index a1f8eee79..393d6573f 100644
--- a/Assets/Mirror/Tests/Editor/MessagePackerTest.cs
+++ b/Assets/Mirror/Tests/Editor/MessagePackerTest.cs
@@ -22,6 +22,19 @@ public void TestPacking()
             Assert.That(unpacked.sceneOperation, Is.EqualTo(SceneOperation.LoadAdditive));
         }
 
+        [Test]
+        public void UnpackWrongMessage()
+        {
+            ConnectMessage message = new ConnectMessage();
+
+            byte[] data = MessagePacker.Pack(message);
+
+            Assert.Throws<FormatException>(() =>
+            {
+                DisconnectMessage unpacked = MessagePacker.Unpack<DisconnectMessage>(data);
+            });
+        }
+
         [Test]
         public void TestUnpackIdMismatch()
         {