--- a/proxy_cookie.t
+++ b/proxy_cookie.t
@@ -37,11 +37,11 @@ http {
     %%TEST_GLOBALS_HTTP%%
 
     server {
-        listen       127.0.0.1:8080;
+        listen       127.0.0.1:%%PORT_0%%;
         server_name  localhost;
 
         location / {
-            proxy_pass http://127.0.0.1:8081;
+            proxy_pass http://127.0.0.1:%%PORT_1%%;
 
             proxy_cookie_domain www.example.org .example.com;
             proxy_cookie_domain .$server_name.com en.$server_name.org;
@@ -55,7 +55,7 @@ http {
     }
 
     server {
-        listen       127.0.0.1:8081;
+        listen       127.0.0.1:%%PORT_1%%;
         server_name  localhost;
 
         location / {
@@ -77,6 +77,8 @@ EOF
 
 ###############################################################################
 
+my $port = port(0);
+
 is(http_get_set_cookie('/?domain=www.Example.org'),
 	'v=path=domain=; Domain=example.com', 'domain rewrite');
 is(http_get_set_cookie('/?domain=.LocalHost.com'),
@@ -103,7 +105,7 @@ is(http_get_set_cookie('/?domain=www.exa
 
 sub http_get_set_cookie {
 	my ($uri) = @_;
-	http_get("http://127.0.0.1:8080$uri") =~ /^Set-Cookie:\s(.+?)\x0d?$/mi;
+	http_get("http://127.0.0.1:$port$uri") =~ /^Set-Cookie:\s(.+?)\x0d?$/mi;
 	return $1;
 }