diff --git a/src/microhttpd/test_upgrade.c b/src/microhttpd/test_upgrade.c
index 06e66a3c..fb3f504a 100644
--- a/src/microhttpd/test_upgrade.c
+++ b/src/microhttpd/test_upgrade.c
@@ -720,7 +720,7 @@ run_usock_client (void *cls)
   struct wr_socket *sock = cls;
 
   send_all (sock,
-            "GET / HTTP/1.1\r\nConnection: Upgrade\r\n\r\n");
+            "GET / HTTP/1.1\r\nHost: localhost\r\nConnection: Upgrade\r\n\r\n");
   recv_hdr (sock);
   recv_all (sock,
             "Hello");
diff --git a/src/microhttpd/test_upgrade_large.c b/src/microhttpd/test_upgrade_large.c
index 817408fb..ae360465 100644
--- a/src/microhttpd/test_upgrade_large.c
+++ b/src/microhttpd/test_upgrade_large.c
@@ -907,7 +907,7 @@ run_usock_client (void *cls)
   struct wr_socket *sock = cls;
 
   send_all (sock,
-            "GET / HTTP/1.1\r\nConnection: Upgrade\r\n\r\n");
+            "GET / HTTP/1.1\r\nHost: localhost\r\nConnection: Upgrade\r\n\r\n");
   recv_hdr (sock);
   recv_all (sock,
             LARGE_STRING);