diff --git a/config.h.in b/config.h.in
index 89e52a296b6..c28e380682b 100644
--- a/config.h.in
+++ b/config.h.in
@@ -552,9 +552,6 @@
 /* Define if you have the <sys/socket.h> header file.  */
 #undef HAVE_SYS_SOCKET_H
 
-/* Define if you have the <sys/socket.h> header file.  */
-#undef HAVE_SYS_SOCKET_H
-
 /* Define if you have the <sys/time.h> header file.  */
 #undef HAVE_SYS_TIME_H