diff --git a/cmd/admin.go b/cmd/admin.go
index f9fb1b6c6..2725b1f1c 100644
--- a/cmd/admin.go
+++ b/cmd/admin.go
@@ -151,6 +151,7 @@ var (
 			Name:  "secret",
 			Value: "",
 			Usage: "Client Secret",
+			EnvVar: "FORGEJO_ADMIN_OAUTH2_SECRET",
 		},
 		cli.StringFlag{
 			Name:  "auto-discover-url",