diff --git a/Assets/Mirror/Examples/RigidbodyPhysics/Scripts/AddForce.cs b/Assets/Mirror/Examples/RigidbodyPhysics/Scripts/AddForce.cs
index ccbd6d225..2242bb2c4 100644
--- a/Assets/Mirror/Examples/RigidbodyPhysics/Scripts/AddForce.cs
+++ b/Assets/Mirror/Examples/RigidbodyPhysics/Scripts/AddForce.cs
@@ -19,9 +19,10 @@ public override void OnStartServer()
             rigidbody3d.isKinematic = false;
         }
 
+        [ServerCallback]
         void Update()
         {
-            if (isServer && Input.GetKeyDown(KeyCode.Space))
+            if (Input.GetKeyDown(KeyCode.Space))
                 rigidbody3d.AddForce(Vector3.up * force);
         }
     }