diff --git a/components/engine/README.md b/components/engine/README.md
index 9a6bf8b445..c1c155ac73 100644
--- a/components/engine/README.md
+++ b/components/engine/README.md
@@ -148,7 +148,7 @@ Starting a long-running worker process
 	(docker -d || echo "Docker daemon already running") &
 
 	# Start a very useful long-running process
-	JOB=$(docker run base /bin/sh -c "while true; do echo Hello world!; sleep 1; done")
+	JOB=$(docker run base /bin/sh -c "while true; do echo Hello world; sleep 1; done")
 
 	# Collect the output of the job so far
 	docker logs $JOB
diff --git a/components/engine/network.go b/components/engine/network.go
index 1b6395b0b1..01d84379a2 100644
--- a/components/engine/network.go
+++ b/components/engine/network.go
@@ -279,7 +279,7 @@ func (iface *NetworkInterface) AllocatePort(port int) (int, error) {
 	if err != nil {
 		return -1, err
 	}
-	if err := iface.manager.portMapper.Map(extPort, net.TCPAddr{iface.IPNet.IP, port}); err != nil {
+	if err := iface.manager.portMapper.Map(extPort, net.TCPAddr{IP: iface.IPNet.IP, Port: port}); err != nil {
 		iface.manager.portAllocator.Release(extPort)
 		return -1, err
 	}
@@ -319,7 +319,7 @@ func (manager *NetworkManager) Allocate() (*NetworkInterface, error) {
 		return nil, err
 	}
 	iface := &NetworkInterface{
-		IPNet:   net.IPNet{ip, manager.bridgeNetwork.Mask},
+		IPNet:   net.IPNet{IP: ip, Mask: manager.bridgeNetwork.Mask},
 		Gateway: manager.bridgeNetwork.IP,
 		manager: manager,
 	}