diff --git a/EnvelopeGenerator.Web/Controllers/HomeController.cs b/EnvelopeGenerator.Web/Controllers/HomeController.cs
index df62b0a0..d551397b 100644
--- a/EnvelopeGenerator.Web/Controllers/HomeController.cs
+++ b/EnvelopeGenerator.Web/Controllers/HomeController.cs
@@ -179,7 +179,7 @@ namespace EnvelopeGenerator.Web.Controllers
                 var expiration = await _dCache.GetDateTimeAsync(key);
                 if (expiration is null || expiration <= DateTime.Now)
                 {
-                    var new_expiration = DateTime.Now.AddMinutes(SmsTotpStep);
+                    var new_expiration = DateTime.Now.AddSeconds(SmsTotpStep);
                     var totp = _codeGenerator.GenerateTotp(er_secret.Receiver!.TotpSecretkey!, SmsTotpStep);
                     var msg = string.Format(SmsFormat, totp, new_expiration.ToString(SmsCodeExpiration.DateTimeFormat, SmsCodeExpiration.CultureInfo));
                     var smsRes = await _msgService.SendSmsAsync(er_secret.PhoneNumber!, msg);