diff --git a/Cargo.lock b/Cargo.lock
index ad1c3d1..a926352 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1563,7 +1563,7 @@ dependencies = [
 [[package]]
 name = "primitives"
 version = "0.1.0"
-source = "git+https://github.com/AdExNetwork/adex-validator-stack-rust?branch=bugfixes#07101f4937ef3275d2f7b20f14589d674601dd0b"
+source = "git+https://github.com/AdExNetwork/adex-validator-stack-rust?branch=bugfixes#20ac5e78b6c2bc94aebe4806a256421247a3866b"
 dependencies = [
  "async-trait",
  "chrono",
diff --git a/src/lib.rs b/src/lib.rs
index 9a4d5bd..e22b6ac 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,7 +7,7 @@ use std::net::SocketAddr;
 use std::sync::Arc;
 use thiserror::Error;
 
-use http::{StatusCode, Uri};
+use http::{header::HOST, StatusCode, Uri};
 use slog::{error, info, Logger};
 
 pub mod cache;
@@ -141,6 +141,25 @@ async fn handle<C: cache::Client>(
 
             *req.uri_mut() = uri.parse::<Uri>()?;
 
+            // for Cloudflare we need to add a HOST header
+            let market_host_header = {
+                let url = market.market_url.to_url();
+                let host = url
+                    .host_str()
+                    .expect("MarketUrl always has a host")
+                    .to_string();
+
+                match url.port() {
+                    Some(port) => format!("{}:{}", host, port),
+                    None => host,
+                }
+            };
+
+            let host = market_host_header
+                .parse()
+                .expect("The MarketUrl should be valid HOST header");
+            req.headers_mut().insert(HOST, host);
+
             let proxy_response = match client.request(req).await {
                 Ok(response) => {
                     info!(&logger, "Proxied request to market"; "uri" => uri, "method" => %method);