ignore EV_CUSTOM in ev_io_init()

1 files changed, 1 insertions, 1 deletions

diff --git a/libev/ev.c b/libev/ev.c
index d54710f..4005ee5 100644
--- a/libev/ev.c
+++ b/libev/ev.c
@@ -4339,7 +4339,7 @@ ev_io_start (EV_P_ ev_io *w) EV_NOEXCEPT
     return;
 
   assert (("libev: ev_io_start called with negative fd", fd >= 0));
-  assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
+  assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE | EV_CUSTOM))));
 
 #if EV_VERIFY >= 2
   assert (("libev: ev_io_start called on watcher with invalid fd", fd_valid (fd)));