diff --git a/foundry/src/Dispatcher.sol b/foundry/src/Dispatcher.sol
index ae8deba..6966b49 100644
--- a/foundry/src/Dispatcher.sol
+++ b/foundry/src/Dispatcher.sol
@@ -109,5 +109,10 @@ contract Dispatcher {
                 )
             );
         }
+
+        // to prevent multiple callbacks
+        assembly {
+            tstore(0, 0)
+        }
     }
 }