diff --git a/quiche/quic/masque/masque_ohttp_client_bin.cc b/quiche/quic/masque/masque_ohttp_client_bin.cc
index df2aca2..f7185de 100644
--- a/quiche/quic/masque/masque_ohttp_client_bin.cc
+++ b/quiche/quic/masque/masque_ohttp_client_bin.cc
@@ -165,7 +165,6 @@
     request.headers[":scheme"] = url.scheme();
     request.headers[":authority"] = url.HostPort();
     request.headers[":path"] = url.path();
-    request.headers["host"] = url.HostPort();
     request.headers["accept"] = "application/ohttp-keys";
     request.headers["content-type"] = "application/ohttp-keys";
     absl::StatusOr<RequestId> request_id =
@@ -268,7 +267,6 @@
     request.headers[":scheme"] = relay_url_.scheme();
     request.headers[":authority"] = relay_url_.HostPort();
     request.headers[":path"] = relay_url_.path();
-    request.headers["host"] = relay_url_.HostPort();
     request.headers["content-type"] = "message/ohttp-req";
     request.body = ohttp_request->EncapsulateAndSerialize();
     absl::StatusOr<RequestId> request_id =
diff --git a/quiche/quic/masque/masque_tcp_client_bin.cc b/quiche/quic/masque/masque_tcp_client_bin.cc
index 3f9d774..fc57693 100644
--- a/quiche/quic/masque/masque_tcp_client_bin.cc
+++ b/quiche/quic/masque/masque_tcp_client_bin.cc
@@ -476,7 +476,6 @@
     headers[":scheme"] = url_.scheme();
     headers[":authority"] = url_.HostPort();
     headers[":path"] = url_.path();
-    headers["host"] = url_.HostPort();
     stream_id_ = h2_connection_->SendRequest(headers, std::string());
     h2_connection_->AttemptToSend();
     if (stream_id_ >= 0) {