diff --git a/data/user.go b/data/user.go
index 6f328fb..b5ea0d2 100644
--- a/data/user.go
+++ b/data/user.go
@@ -32,7 +32,7 @@ type Login struct {
 }
 
 func derive(password string, salt []byte) ([]byte, error) {
-	return scrypt.Key([]byte(password), salt, scryptN, scryptR, scryptP, 30)
+	return scrypt.Key([]byte(password), salt, scryptN, scryptR, scryptP, 32)
 }
 
 func (u *User) Check(login *Login) bool {