diff --git a/sess.go b/sess.go
index 35e7b804..c68987ff 100644
--- a/sess.go
+++ b/sess.go
@@ -380,7 +380,7 @@ func (s *UDPSession) SetDeadline(t time.Time) error {
 	s.wd = t
 	s.notifyReadEvent()
 	s.notifyWriteEvent()
-	return nil
+	return s.conn.SetDeadline(t)
 }
 
 // SetReadDeadline implements the Conn SetReadDeadline method.
@@ -389,7 +389,7 @@ func (s *UDPSession) SetReadDeadline(t time.Time) error {
 	defer s.mu.Unlock()
 	s.rd = t
 	s.notifyReadEvent()
-	return nil
+	return s.conn.SetReadDeadline(t)
 }
 
 // SetWriteDeadline implements the Conn SetWriteDeadline method.
@@ -398,7 +398,7 @@ func (s *UDPSession) SetWriteDeadline(t time.Time) error {
 	defer s.mu.Unlock()
 	s.wd = t
 	s.notifyWriteEvent()
-	return nil
+	return s.conn.SetWriteDeadline(t)
 }
 
 // SetWriteDelay delays write for bulk transfer until the next update interval