diff --git a/radicale/auth/htpasswd.py b/radicale/auth/htpasswd.py
index f444fdc3..22b1b1ba 100644
--- a/radicale/auth/htpasswd.py
+++ b/radicale/auth/htpasswd.py
@@ -283,6 +283,6 @@ class Auth(auth.BaseAuth):
                 logger.debug("Login verification failed for user: '%s' ( method '%s')", login, method)
         else:
             # dummy delay
-            (method, password_ok) = self._plain(str(htpasswd_mtime_ns), password)
+            (method, password_ok) = self._plain(str(time.time_ns()), password)
             logger.debug("Login verification user not found: '%s'", login)
         return ""