diff --git a/draft-ietf-quic-tls.md b/draft-ietf-quic-tls.md
index 4e10a0dfe0..1fede758f0 100644
--- a/draft-ietf-quic-tls.md
+++ b/draft-ietf-quic-tls.md
@@ -1020,7 +1020,7 @@ are marked with a KEY_PHASE of 0.
 ### Retransmission and Acknowledgment of Unprotected Packets
 
 TLS handshake messages from both client and server are critical to the key
-exchange.  The contents of these messages determines the keys used to protect
+exchange.  The contents of these messages determine the keys used to protect
 later messages.  If these handshake messages are included in packets that are
 protected with these keys, they will be indecipherable to the recipient.