diff --git a/components/engine/cmd/docker/docker.go b/components/engine/cmd/docker/docker.go
index 18cd0e833c..1978fc33bc 100644
--- a/components/engine/cmd/docker/docker.go
+++ b/components/engine/cmd/docker/docker.go
@@ -79,7 +79,7 @@ func noArgs(cmd *cobra.Command, args []string) error {
 		return nil
 	}
 	return fmt.Errorf(
-		"docker: '%s' is not a docker command.\nSee 'docker --help'%s", args[0], ".")
+		"docker: '%s' is not a docker command.\nSee 'docker --help'.", args[0])
 }
 
 func main() {