diff --git a/container/backend/backend.go b/container/backend/backend.go
index a768e32..9f92840 100644
--- a/container/backend/backend.go
+++ b/container/backend/backend.go
@@ -13,7 +13,7 @@ import (
 
 type Backend interface {
 	Monitor(eventsChan chan<- event.Event, errChan chan<- error)
-	Exec(actionsChan chan<- action.Action, errChan chan<- error)
+	Exec(actionsChan <-chan action.Action, errChan chan<- error)
 }
 
 func NewBackend(name string, c config.BackendConfig) (Backend, error) {
diff --git a/container/backend/docker/docker.go b/container/backend/docker/docker.go
index 5d3f0ef..ff01939 100644
--- a/container/backend/docker/docker.go
+++ b/container/backend/docker/docker.go
@@ -90,6 +90,6 @@ func (d *Docker) Monitor(eventsChan chan<- kevent.Event, errChan chan<- error) {
 	}
 }
 
-func (d *Docker) Exec(actionsChan chan<- kaction.Action, errChan chan<- error) {
+func (d *Docker) Exec(actionsChan <-chan kaction.Action, errChan chan<- error) {
 	log.Debug("[Docker][Exec] Start")
 }
diff --git a/engine/engine.go b/engine/engine.go
index 59e29c4..7ae9e95 100644
--- a/engine/engine.go
+++ b/engine/engine.go
@@ -3,16 +3,16 @@ package engine
 import (
 	log "github.com/Sirupsen/logrus"
 	"github.com/opsfactory/kappa/container/action"
-	"github.com/opsfactory/kappa/container/backend"
+	containerBackend "github.com/opsfactory/kappa/container/backend"
 	"github.com/opsfactory/kappa/container/event"
 )
 
 type Engine struct {
-	backend backend.Backend
+	containerBackend containerBackend.Backend
 }
 
-func NewEngine(b backend.Backend) *Engine {
-	return &Engine{backend: b}
+func NewEngine(b containerBackend.Backend) *Engine {
+	return &Engine{containerBackend: b}
 }
 
 func (e Engine) Run() error {
@@ -21,8 +21,8 @@ func (e Engine) Run() error {
 	eventsChan := make(chan event.Event)
 	actionsChan := make(chan action.Action)
 
-	go e.backend.Monitor(eventsChan, errChan)
-	go e.backend.Exec(actionsChan, errChan)
+	go e.containerBackend.Monitor(eventsChan, errChan)
+	go e.containerBackend.Exec(actionsChan, errChan)
 	go e.handleEvent(eventsChan, actionsChan, errChan)
 
 	for err := range errChan {