--- a/fastcgi_buffering.t
+++ b/fastcgi_buffering.t
@@ -41,11 +41,11 @@ http {
     %%TEST_GLOBALS_HTTP%%
 
     server {
-        listen       127.0.0.1:8080;
+        listen       127.0.0.1:%%PORT_0%%;
         server_name  localhost;
 
         location / {
-            fastcgi_pass 127.0.0.1:8081;
+            fastcgi_pass 127.0.0.1:%%PORT_1%%;
             fastcgi_param REQUEST_URI $request_uri;
             fastcgi_buffering off;
         }
@@ -64,7 +64,7 @@ EOF
 
 $t->run()->plan(2);
 
-$t->run_daemon(\&fastcgi_daemon)->waitforsocket('127.0.0.1:8081');
+$t->run_daemon(\&fastcgi_daemon)->waitforsocket('127.0.0.1:' . port(1));
 
 ###############################################################################
 
@@ -74,7 +74,7 @@ like(http_get('/inmemory.html'), qr/set:
 ###############################################################################
 
 sub fastcgi_daemon {
-	my $socket = FCGI::OpenSocket('127.0.0.1:8081', 5);
+	my $socket = FCGI::OpenSocket('127.0.0.1:' . port(1), 5);
 	my $request = FCGI::Request(\*STDIN, \*STDOUT, \*STDERR, \%ENV,
 		$socket);