diff --git a/config.h.in b/config.h.in
index 56af1f3a..ee64cd1d 100644
--- a/config.h.in
+++ b/config.h.in
@@ -182,9 +182,6 @@
 /* Define if you have the getcwd function.  */
 #undef HAVE_GETCWD
 
-/* Define if you have the getdtablesize function.  */
-#undef HAVE_GETDTABLESIZE
-
 /* Define if you have the getgroups function.  */
 #undef HAVE_GETGROUPS