diff --git a/cmd/justcaptchad/main.go b/cmd/justcaptchad/main.go
index d9fed98..fbb8f0a 100644
--- a/cmd/justcaptchad/main.go
+++ b/cmd/justcaptchad/main.go
@@ -16,7 +16,7 @@ import (
 )
 
 var listenAddress *string = flag.String("listen", "/var/run/justcaptcha/c.sock", "listen address (ip:port|unix_path)")
-var captchaExpire *time.Duration = flag.Duration("expire", 5*time.Minute, "CAPTCHA expiration in format XX{s,m,h}, e.g. 5m, 300s")
+var captchaExpiry *time.Duration = flag.Duration("expiry", 5*time.Minute, "CAPTCHA expiry in format XX{s,m,h}, e.g. 5m, 300s")
 var showVersion *bool = flag.Bool("v", false, "show version")
 
 func main() {
@@ -28,7 +28,7 @@ func main() {
 		return
 	}
 
-	captcha.Init(*captchaExpire)
+	captcha.Init(*captchaExpiry)
 
 	hand := handlers.New()
 	srv := server.NewHttpServer()