diff --git a/t/000_init.t b/t/000_init.t
index 6c96c571..90ab5ed8 100644
--- a/t/000_init.t
+++ b/t/000_init.t
@@ -7,10 +7,12 @@ repeat_each(1);
 
 plan tests => repeat_each() * blocks();
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server  127.0.0.1:5432 dbname=ngx_test
-                         user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
diff --git a/t/auth.t b/t/auth.t
index 3443a401..91e46f54 100644
--- a/t/auth.t
+++ b/t/auth.t
@@ -7,10 +7,12 @@ repeat_each(2);
 
 plan tests => repeat_each() * (blocks() * 3 - 2 * 1);
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
diff --git a/t/errors.t b/t/errors.t
index a236cbd6..f09e7972 100644
--- a/t/errors.t
+++ b/t/errors.t
@@ -7,10 +7,12 @@ repeat_each(2);
 
 plan tests => repeat_each() * blocks();
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
@@ -38,8 +40,8 @@ GET /postgres
 === TEST 2: wrong credentials
 --- http_config
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=wrong_pass;
+        postgres_server     127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                            dbname=ngx_test user=ngx_test password=wrong_pass;
     }
 --- config
     location /postgres {
diff --git a/t/eval.t b/t/eval.t
index d89dbc73..320b0aae 100644
--- a/t/eval.t
+++ b/t/eval.t
@@ -7,10 +7,12 @@ repeat_each(2);
 
 plan tests => repeat_each() * (blocks() * 3);
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
@@ -24,8 +26,8 @@ __DATA__
 === TEST 1: sanity
 --- http_config
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server     127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                            dbname=ngx_test user=ngx_test password=ngx_test;
     }
 
     server {
diff --git a/t/form.disabled b/t/form.disabled
index 84be8486..f93996c1 100644
--- a/t/form.disabled
+++ b/t/form.disabled
@@ -7,10 +7,12 @@ repeat_each(2);
 
 plan tests => repeat_each() * (blocks() * 3);
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
diff --git a/t/methods.t b/t/methods.t
index bca35191..866f7077 100644
--- a/t/methods.t
+++ b/t/methods.t
@@ -7,10 +7,12 @@ repeat_each(2);
 
 plan tests => repeat_each() * (blocks() * 3 - 2 * 2);
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
diff --git a/t/output.t b/t/output.t
index 728a8841..b5dd728e 100644
--- a/t/output.t
+++ b/t/output.t
@@ -7,10 +7,12 @@ repeat_each(2);
 
 plan tests => repeat_each() * (blocks() * 3 - 4 * 2);
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
diff --git a/t/restful.t b/t/restful.t
index 83f1fae3..f3407a3b 100644
--- a/t/restful.t
+++ b/t/restful.t
@@ -7,10 +7,12 @@ repeat_each(1);
 
 plan tests => repeat_each() * (blocks() * 3);
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
diff --git a/t/restful_json.t b/t/restful_json.t
index 3adb7e58..10ca6c06 100644
--- a/t/restful_json.t
+++ b/t/restful_json.t
@@ -7,10 +7,12 @@ repeat_each(1);
 
 plan tests => repeat_each() * (blocks() * 3);
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
diff --git a/t/rewrites.t b/t/rewrites.t
index d617e4de..b82a785c 100644
--- a/t/rewrites.t
+++ b/t/rewrites.t
@@ -7,10 +7,12 @@ repeat_each(2);
 
 plan tests => repeat_each() * (blocks() * 2);
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
diff --git a/t/sanity.t b/t/sanity.t
index eb36ff01..23363de9 100644
--- a/t/sanity.t
+++ b/t/sanity.t
@@ -7,10 +7,12 @@ repeat_each(2);
 
 plan tests => repeat_each() * (blocks() * 3);
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_
 
@@ -24,8 +26,8 @@ __DATA__
 === TEST 1: sanity
 --- http_config
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server     127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                            dbname=ngx_test user=ngx_test password=ngx_test;
         postgres_keepalive  off;
     }
 --- config
diff --git a/t/variables.t b/t/variables.t
index 60229139..de6ec7fa 100644
--- a/t/variables.t
+++ b/t/variables.t
@@ -7,10 +7,12 @@ repeat_each(2);
 
 plan tests => repeat_each() * (blocks() * 3 + 1 * 4 + 1 * 1 - 5 * 2);
 
+$ENV{TEST_NGINX_POSTGRESQL_PORT} ||= 5432;
+
 our $http_config = <<'_EOC_';
     upstream database {
-        postgres_server     127.0.0.1:5432 dbname=ngx_test
-                            user=ngx_test password=ngx_test;
+        postgres_server  127.0.0.1:$TEST_NGINX_POSTGRESQL_PORT
+                         dbname=ngx_test user=ngx_test password=ngx_test;
     }
 _EOC_