diff --git a/src/event.c b/src/event.c
index 53ddc7e..ea38ef0 100644
--- a/src/event.c
+++ b/src/event.c
@@ -138,9 +138,7 @@ int hyper_event_write(struct hyper_event *he, int efd)
 	memmove(buf->data, buf->data + len, buf->get);
 
 	if (buf->get == 0) {
-		hyper_modify_event(ctl.efd, he, he->flag & ~(EPOLLOUT| EPOLLPRI));
-	} else if (!FULL(buf)) {
-		hyper_modify_event(ctl.efd, he, he->flag & ~EPOLLPRI);
+		hyper_modify_event(ctl.efd, he, he->flag & ~EPOLLOUT);
 	}
 
 	return 0;
diff --git a/src/exec.c b/src/exec.c
index be17344..68e1515 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -110,7 +110,6 @@ static int pts_loop(struct hyper_event *de, uint64_t seq, int efd, struct hyper_
 	struct hyper_buf *buf = &ctl.tty.wbuf;
 
 	if (FULL(buf)) {
-		flag |= EPOLLPRI;
 		goto out;
 	}
 
@@ -139,7 +138,6 @@ static int pts_loop(struct hyper_event *de, uint64_t seq, int efd, struct hyper_
 	} while (!FULL(buf));
 
 	if (FULL(buf)) {
-		flag |= EPOLLPRI;
 		/* del & add event to move event to tail, this gives
 		 * other event a chance to write data to wbuf of tty. */
 		hyper_requeue_event(ctl.efd, de);