1 files changed, 2 insertions, 1 deletions

diff --git a/src/examples/fileserver_example_external_select.c b/src/examples/fileserver_example_external_select.c
index b863fcbf..d6b8fa23 100644
--- a/src/examples/fileserver_example_external_select.c
+++ b/src/examples/fileserver_example_external_select.c
@@ -117,7 +117,8 @@ main (int argc, char *const *argv)
       FD_ZERO (&rs);
       FD_ZERO (&ws);
       FD_ZERO (&es);
-      MHD_get_fdset (d, &rs, &ws, &es, &max);
+      if (MHD_YES != MHD_get_fdset (d, &rs, &ws, &es, &max))
+        break; /* fatal internal error */
       if (MHD_get_timeout (d, &mhd_timeout) == MHD_YES)
 
         {