diff --git a/main.go b/main.go
index 7569da3..b5f85ab 100644
--- a/main.go
+++ b/main.go
@@ -40,7 +40,7 @@ func main() {
 		cli.StringFlag{
 			Name:   "daemon.mirror",
 			Usage:  "docker daemon registry mirror",
-			EnvVar: "PLUGIN_REGISTRY",
+			EnvVar: "PLUGIN_MIRROR",
 		},
 		cli.StringFlag{
 			Name:   "daemon.storage-driver",