diff --git a/network.go b/network.go
index b2c6f638ce..95b5893122 100644
--- a/network.go
+++ b/network.go
@@ -349,6 +349,9 @@ func newNetworkManager(bridgeIface string) (*NetworkManager, error) {
 	}
 
 	portMapper, err := newPortMapper()
+	if err != nil {
+		return nil, err
+	}
 
 	manager := &NetworkManager{
 		bridgeIface:   bridgeIface,