diff --git a/common.c b/common.c
index 9d26799..d10a115 100644
--- a/common.c
+++ b/common.c
@@ -1285,7 +1285,7 @@ poller_set (struct poller *self, int fd, short events,
 	new_entry->fd = fd;
 	new_entry->events = events;
 
-	self->fds_info[self->len] = (struct poller_info) { dispatcher, data };
+	self->fds_info[index] = (struct poller_info) { dispatcher, data };
 }
 
 static void