diff --git a/config.h.in b/config.h.in
index ee64cd1d..cc2f1afe 100644
--- a/config.h.in
+++ b/config.h.in
@@ -173,9 +173,6 @@
 /* Define this if you have the `union wait' type in <sys/wait.h>.  */
 #undef HAVE_UNION_WAIT
 
-/* Define this if the POSIX.1 call `sysconf (_SC_OPEN_MAX)' works properly.  */
-#undef HAVE_SYSCONF_OPEN_MAX
-
 /* Define if you have the dup2 function.  */
 #undef HAVE_DUP2