diff --git a/util/event_notifier-posix.c b/util/event_notifier-posix.c
index ed4ca2b..d4a0c63 100644
--- a/util/event_notifier-posix.c
+++ b/util/event_notifier-posix.c
@@ -77,7 +77,7 @@
     close(e->wfd);
 }
 
-int event_notifier_get_fd(EventNotifier *e)
+int event_notifier_get_fd(const EventNotifier *e)
 {
     return e->rfd;
 }