diff --git a/manifests/resource/upstream/member.pp b/manifests/resource/upstream/member.pp
index 075f564a1..8c6ca95ae 100644
--- a/manifests/resource/upstream/member.pp
+++ b/manifests/resource/upstream/member.pp
@@ -75,9 +75,10 @@
     default  => "${nginx::config::conf_dir}/conf.d",
   }
 
-  $_server = ($server =~ Pattern[/^unix:\/([^\/\0]+\/*)*$/]) ? {
-    true  => $server,
-    false => "${server}:${port}",
+  $_server = $server ? {
+    Pattern[/^unix:\/([^\/\0]+\/*)*$/] => $server,
+    Stdlib::IP::Address::V6            => "[${server}]:${port}", #lint:ignore:unquoted_string_in_selector
+    default                            => "${server}:${port}",
   }
 
   concat::fragment { "${upstream}_upstream_member_${name}":
diff --git a/metadata.json b/metadata.json
index 25467c2bc..7f6616d2a 100644
--- a/metadata.json
+++ b/metadata.json
@@ -10,7 +10,7 @@
   "dependencies": [
     {
       "name": "puppetlabs/stdlib",
-      "version_requirement": ">= 4.22.0 < 6.0.0"
+      "version_requirement": ">= 4.25.0 < 6.0.0"
     },
     {
       "name": "puppetlabs/concat",
diff --git a/spec/acceptance/nginx_upstream_spec.rb b/spec/acceptance/nginx_upstream_spec.rb
index c4c6b35a7..4fec3a103 100644
--- a/spec/acceptance/nginx_upstream_spec.rb
+++ b/spec/acceptance/nginx_upstream_spec.rb
@@ -38,6 +38,11 @@ class { 'nginx': }
           backup       => true,
           comment      => 'Appserver 03',
         },
+        'appserver_v6' => {
+          server       => '2001:db8::6',
+          port         => 80,
+          comment      => 'Appserver with IPv6 address',
+        },
       },
       zone               => 'production 64k',
     }
@@ -78,6 +83,7 @@ class { 'nginx': }
     it { is_expected.to contain '  server 10.10.10.1:80 weight=2 max_conns=10 max_fails=10 fail_timeout=10s; # Appserver 01' }
     it { is_expected.to contain '  server 10.10.10.2:80 weight=3 max_conns=15 max_fails=15 fail_timeout=15s; # Appserver 02' }
     it { is_expected.to contain '  server 10.10.10.3:80 max_conns=20 max_fails=20 fail_timeout=20s backup; # Appserver 03' }
+    it { is_expected.to contain '  server [2001:db8::6]:80 max_conns=20 max_fails=20 fail_timeout=20s; # Appserver with IPv6 address' }
     it { is_expected.to contain '  ip_hash;' }
     it { is_expected.to contain '  zone production 64k;' }
     it { is_expected.to contain '  keepalive 16;' }
diff --git a/spec/defines/resource_upstream_spec.rb b/spec/defines/resource_upstream_spec.rb
index 454a71508..94a4cd836 100644
--- a/spec/defines/resource_upstream_spec.rb
+++ b/spec/defines/resource_upstream_spec.rb
@@ -295,6 +295,14 @@
                 value: { member1: { server: '127.0.0.1', port: 8080 } },
                 match: '127.0.0.1:8080;'
               },
+              {
+                value: { member1: { server: '2001:db8::1' } },
+                match: '[2001:db8::1]:80;'
+              },
+              {
+                value: { member1: { server: '2001:db8::1', port: 8080 } },
+                match: '[2001:db8::1]:8080;'
+              },
               {
                 value: { member1: { weight: 20 } },
                 match: 'member1:80 weight=20;'