diff --git a/pkg/captcha/captcha.go b/pkg/captcha/captcha.go
index 6b07607..411d013 100644
--- a/pkg/captcha/captcha.go
+++ b/pkg/captcha/captcha.go
@@ -2,7 +2,6 @@ package captcha
 
 import (
 	"crypto/rand"
-	"errors"
 	"image"
 	"math/big"
 	"time"
@@ -12,8 +11,6 @@ const (
 	maxAnswer = 999999
 )
 
-var errorNotFound = errors.New("captcha not found")
-
 type Answer string
 
 // Captcha interface that should be implemented by captcha.
diff --git a/pkg/captcha/db.go b/pkg/captcha/db.go
index c510864..cfb6af8 100644
--- a/pkg/captcha/db.go
+++ b/pkg/captcha/db.go
@@ -3,12 +3,15 @@ package captcha
 import (
 	"crypto/sha256"
 	"encoding/base64"
+	"errors"
 	"image"
 	"strconv"
 	"sync"
 	"time"
 )
 
+var errorNotFound = errors.New("captcha not found")
+
 var expiredScanInterval = 60 * time.Second
 
 type ID string