diff --git a/include/openssl/tls1.h b/include/openssl/tls1.h
index 03b218b..e395852 100644
--- a/include/openssl/tls1.h
+++ b/include/openssl/tls1.h
@@ -208,7 +208,7 @@
 // ExtensionType value from draft-ietf-quic-tls. Note that this collides with
 // TLS-LTS and, based on scans, something else too. Since it's QUIC-only, that
 // shouldn't be a problem in practice.
-#define TLSEXT_TYPE_quic_transport_parameters 26
+#define TLSEXT_TYPE_quic_transport_parameters 0xffa5
 
 // ExtensionType value assigned to
 // https://tools.ietf.org/html/draft-ietf-tls-certificate-compression-03