diff --git a/files/gitlab-cookbooks/gitlab-pages/libraries/gitlab_pages.rb b/files/gitlab-cookbooks/gitlab-pages/libraries/gitlab_pages.rb
index 2af6ead1b..49a1c96e1 100644
--- a/files/gitlab-cookbooks/gitlab-pages/libraries/gitlab_pages.rb
+++ b/files/gitlab-cookbooks/gitlab-pages/libraries/gitlab_pages.rb
@@ -89,7 +89,12 @@ module GitlabPages
 
       pages_uri = URI(Gitlab['pages_external_url'].to_s)
       parsed_port = [80, 443].include?(pages_uri.port) ? "" : ":#{pages_uri.port}"
-      Gitlab['gitlab_pages']['auth_redirect_uri'] = pages_uri.scheme + '://projects.' + pages_uri.host + parsed_port + '/auth'
+
+      Gitlab['gitlab_pages']['auth_redirect_uri'] = if Gitlab['gitlab_pages']['namespace_in_path']
+                                                      "#{pages_uri.scheme}://#{pages_uri.host}#{parsed_port}/projects/auth"
+                                                    else
+                                                      "#{pages_uri.scheme}://projects.#{pages_uri.host}#{parsed_port}/auth"
+                                                    end
     end
 
     def authorize_with_gitlab
diff --git a/spec/chef/cookbooks/gitlab-pages/recipes/gitlab-pages_spec.rb b/spec/chef/cookbooks/gitlab-pages/recipes/gitlab-pages_spec.rb
index 838664bef..42d023b6e 100644
--- a/spec/chef/cookbooks/gitlab-pages/recipes/gitlab-pages_spec.rb
+++ b/spec/chef/cookbooks/gitlab-pages/recipes/gitlab-pages_spec.rb
@@ -169,6 +169,44 @@ RSpec.describe 'gitlab::gitlab-pages' do
           chef_run
         end
       end
+
+      context 'when namespace in path is enabled' do
+        before do
+          stub_gitlab_rb(
+            pages_external_url: 'https://pages.example.com',
+            gitlab_pages: {
+              access_control: true,
+              namespace_in_path: true,
+            }
+          )
+        end
+
+        it 'renders pages config file with default auth-redirect-uri' do
+          expect(chef_run).to render_file("/var/opt/gitlab/gitlab-pages/gitlab-pages-config").with_content { |content|
+            expect(content).to match(%r{auth-redirect-uri=https://pages.example.com/projects/auth})
+            expect(content).to match(%r{namespace-in-path=true})
+          }
+        end
+      end
+
+      context 'with custom port and namespace in path is enabled' do
+        before do
+          stub_gitlab_rb(
+            pages_external_url: 'https://pages.example.com:8443',
+            gitlab_pages: {
+              access_control: true,
+              namespace_in_path: true,
+            }
+          )
+        end
+
+        it 'renders pages config file with default auth-redirect-uri' do
+          expect(chef_run).to render_file("/var/opt/gitlab/gitlab-pages/gitlab-pages-config").with_content { |content|
+            expect(content).to match(%r{auth-redirect-uri=https://pages.example.com:8443/projects/auth})
+            expect(content).to match(%r{namespace-in-path=true})
+          }
+        end
+      end
     end
 
     context 'with custom port' do