Don't tell people to use FD_SETSIZE as the first argument to select().

1 files changed, 1 insertions, 1 deletions

diff --git a/gnu/lib/libreadline/examples/excallback.c b/gnu/lib/libreadline/examples/excallback.c
index ca03fc3dafd..c4588829954 100644
--- a/gnu/lib/libreadline/examples/excallback.c
+++ b/gnu/lib/libreadline/examples/excallback.c
@@ -121,7 +121,7 @@ main()
       FD_ZERO(&fds);
       FD_SET(fileno(stdin), &fds);
 
-      if( select(FD_SETSIZE, &fds, NULL, NULL, NULL) < 0) {
+      if( select(fileno(stdin) + 1, &fds, NULL, NULL, NULL) < 0) {
         perror("select");
         exit(1);
       }