diff --git a/src/acconfig.h b/src/acconfig.h
index 2e46985..c797e5c 100644
--- a/src/acconfig.h
+++ b/src/acconfig.h
@@ -191,14 +191,14 @@
  * If screen is installed with permissions to update /etc/utmp (such
  * as if it is installed set-uid root), define UTMPOK.
  */
-#define UTMPOK
+#undef UTMPOK
 
 /* Set LOGINDEFAULT to one (1)
  * if you want entries added to /etc/utmp by default, else set it to
  * zero (0).
  * LOGINDEFAULT will be one (1) whenever LOGOUTOK is undefined!
  */
-#define LOGINDEFAULT	1
+#undef LOGINDEFAULT
 
 /* Set LOGOUTOK to one (1)
  * if you want the user to be able to log her/his windows out.
@@ -214,7 +214,7 @@
  * Set CAREFULUTMP to one (1) if you want that users have at least one
  * window per screen session logged in.
  */
-#define LOGOUTOK 1
+#undef LOGOUTOK
 #undef CAREFULUTMP