diff --git a/pkg/captcha/captcha.go b/pkg/captcha/captcha.go
index 476dcdc..2b12b45 100644
--- a/pkg/captcha/captcha.go
+++ b/pkg/captcha/captcha.go
@@ -14,7 +14,6 @@ const (
 
 var errorNotFound = errors.New("captcha not found")
 
-type ID string
 type Answer string
 
 type ICaptcha interface {
diff --git a/pkg/captcha/db.go b/pkg/captcha/db.go
index be7d315..758125e 100644
--- a/pkg/captcha/db.go
+++ b/pkg/captcha/db.go
@@ -9,6 +9,8 @@ import (
 	"time"
 )
 
+type ID string
+
 var expiredScanInterval = 60 * time.Second
 
 type ICaptchaDB interface {