diff --git a/cmd/admin_auth_oauth.go b/cmd/admin_auth_oauth.go
index c151c0af27..e8a4f34707 100644
--- a/cmd/admin_auth_oauth.go
+++ b/cmd/admin_auth_oauth.go
@@ -34,6 +34,7 @@ var (
 			Name:  "secret",
 			Value: "",
 			Usage: "Client Secret",
+			EnvVars: []string{"FORGEJO_ADMIN_OAUTH2_SECRET"},
 		},
 		&cli.StringFlag{
 			Name:  "auto-discover-url",