diff --git a/runtime/container.go b/runtime/container.go
index 656e9ae5876384e7be2b66a9e4830edd39469c56..ca7b23e62b169b523277f6d154f5f822ee89ac09 100644
--- a/runtime/container.go
+++ b/runtime/container.go
@@ -426,7 +426,7 @@ func (container *Container) Start() (err error) {
 	defer container.Unlock()
 
 	if container.State.IsRunning() {
-		return fmt.Errorf("The container %s is already running.", container.ID)
+		return nil
 	}
 
 	defer func() {