diff --git a/usr.sbin/ntp/config.h b/usr.sbin/ntp/config.h
index 0b4c5d5d2d3f..34003f923b0f 100644
--- a/usr.sbin/ntp/config.h
+++ b/usr.sbin/ntp/config.h
@@ -439,7 +439,7 @@
 /* #undef HAVE_LIBPOSIX4 */
 
 /* Define to 1 if you have the `readline' library (-lreadline). */
-#define HAVE_LIBREADLINE 1
+/* #undef HAVE_LIBREADLINE */
 
 /* Define to 1 if you have the `rt' library (-lrt). */
 #define HAVE_LIBRT 1
@@ -570,10 +570,10 @@
 /* #undef HAVE_PUTUTXLINE */
 
 /* Define to 1 if you have the <readline/history.h> header file. */
-#define HAVE_READLINE_HISTORY_H 1
+/* #undef HAVE_READLINE_HISTORY_H */
 
 /* Define to 1 if you have the <readline/readline.h> header file. */
-#define HAVE_READLINE_READLINE_H 1
+/* #undef HAVE_READLINE_READLINE_H */
 
 /* Define to 1 if you have the `readlink' function. */
 #define HAVE_READLINK 1