diff --git a/hal_st/middlewares/ble_middleware/GapCentralSt.cpp b/hal_st/middlewares/ble_middleware/GapCentralSt.cpp
index 161e1a22..6c0607bb 100644
--- a/hal_st/middlewares/ble_middleware/GapCentralSt.cpp
+++ b/hal_st/middlewares/ble_middleware/GapCentralSt.cpp
@@ -204,6 +204,8 @@ namespace hal
 
         really_assert(phyUpdateCompleteEvent.Connection_Handle == connectionContext.connectionHandle);
 
+        onMtuExchangeDone = nullptr;
+
         infra::Subject<services::GapCentralObserver>::NotifyObservers([](services::GapCentralObserver& observer)
             {
                 observer.StateChanged(services::GapState::connected);