diff --git a/.github/workflows/dockerimage.yml b/.github/workflows/dockerimage.yml
index 420fa89..be429a2 100644
--- a/.github/workflows/dockerimage.yml
+++ b/.github/workflows/dockerimage.yml
@@ -59,7 +59,7 @@ jobs:
 
         grep --fixed-strings '< HTTP/3 200' /tmp/h3
         grep --fixed-strings '< server: nginx' /tmp/h3
-        grep --fixed-strings '< alt-svc: h3=":8889"; ma=86400' /tmp/h3
+        grep --fixed-strings '< alt-svc: h3-27=":8889"; ma=86400, h3-28=":8889"; ma=86400, h3-29=":8889"; ma=86400' /tmp/h3
         grep --fixed-strings '<p>It works!</p>' /tmp/h3
 
         docker logs test_nginx
diff --git a/tests/https.conf b/tests/https.conf
index a767da6..e93f939 100644
--- a/tests/https.conf
+++ b/tests/https.conf
@@ -19,7 +19,7 @@ server {
     ssl_early_data on;
 
     # Add Alt-Svc header to negotiate HTTP/3.
-    add_header alt-svc 'h3=":8889"; ma=86400';
+    add_header alt-svc 'h3-27=":8889"; ma=86400, h3-28=":8889"; ma=86400, h3-29=":8889"; ma=86400';
 
     location / {
         root   /static;