diff --git a/conn.go b/conn.go
index 640e196..30707e0 100644
--- a/conn.go
+++ b/conn.go
@@ -228,9 +228,7 @@ func (hc *halfConn) changeCipherSpec() error {
 	hc.mac = hc.nextMac
 	hc.nextCipher = nil
 	hc.nextMac = nil
-	for i := range hc.seq {
-		hc.seq[i] = 0
-	}
+	clear(hc.seq[:])
 	return nil
 }
 
@@ -239,9 +237,7 @@ func (hc *halfConn) setTrafficSecret(suite *cipherSuiteTLS13, level QUICEncrypti
 	hc.level = level
 	key, iv := suite.trafficKey(secret)
 	hc.cipher = suite.aead(key, iv)
-	for i := range hc.seq {
-		hc.seq[i] = 0
-	}
+	clear(hc.seq[:])
 }
 
 // incSeq increments the sequence number.