1 files changed, 3 insertions, 2 deletions

diff --git a/src/microhttpd/test_upgrade.c b/src/microhttpd/test_upgrade.c
index b691bcda..873b832a 100644
--- a/src/microhttpd/test_upgrade.c
+++ b/src/microhttpd/test_upgrade.c
@@ -564,14 +564,15 @@ make_blocking (MHD_socket fd)
 
   flags = fcntl (fd, F_GETFL);
   if (-1 == flags)
-    return;
+    abort ();
   if ((flags & ~O_NONBLOCK) != flags)
     if (-1 == fcntl (fd, F_SETFL, flags & ~O_NONBLOCK))
       abort ();
 #elif defined(MHD_WINSOCK_SOCKETS)
   unsigned long flags = 0;
 
-  ioctlsocket (fd, (int) FIONBIO, &flags);
+  if (0 != ioctlsocket (fd, (int) FIONBIO, &flags))
+    abort ();
 #endif /* MHD_WINSOCK_SOCKETS */
 
 }