diff --git a/app/app.go b/app/app.go
index e74f7a2..b9c1b8b 100644
--- a/app/app.go
+++ b/app/app.go
@@ -111,6 +111,8 @@ func NewApp(acn connectivity.ACN, appDirectory string, settings *settings.Global
 }
 
 func (app *application) InstallEngineHooks(engineHooks connections.EngineHooks) {
+	app.appmutex.Lock()
+	defer app.appmutex.Unlock()
 	app.engineHooks = engineHooks
 }