diff --git a/pkg/commands/docker.go b/pkg/commands/docker.go
index 857c478a..cb962752 100644
--- a/pkg/commands/docker.go
+++ b/pkg/commands/docker.go
@@ -267,6 +267,7 @@ func (c *DockerCommand) assignContainersToServices(containers []*Container, serv
 	// Index Services by name.
 	serviceMap := make(map[string]*Service)
 	for _, service := range services {
+		service.Containers = make([]*Container, 0, 1)
 		serviceMap[service.Name] = service
 	}