--- a/src/transports/smtp.c
+++ b/src/transports/smtp.c
@@ -938,7 +938,7 @@ if (  sx->early_pipe_active
     if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
       debug_printf("no ehlo-resp record!\n");
     else
-      debug_printf("ehlo-resp record is %d seconds old\n", time(NULL) - er->time_stamp);
+      debug_printf("ehlo-resp record is %.0f seconds old\n", difftime(time(NULL), er->time_stamp));
     }
 
   dbfn_delete(dbm_file, ehlo_resp_key);