diff --git a/README.md b/README.md
index 0aad4e5..017ba72 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
 # PHP Language Server
 
 [![Version](https://img.shields.io/packagist/v/felixfbecker/language-server.svg)](https://packagist.org/packages/felixfbecker/language-server)
-[![Build Status](https://travis-ci.org/felixfbecker/php-language-server.svg?branch=master)](https://travis-ci.org/felixfbecker/php-language-server)
+[![Linux Build Status](https://travis-ci.org/felixfbecker/php-language-server.svg?branch=master)](https://travis-ci.org/felixfbecker/php-language-server)
+[![Windows Build status](https://ci.appveyor.com/api/projects/status/2sp5ll052wdjqmdm/branch/master?svg=true)](https://ci.appveyor.com/project/felixfbecker/php-language-server/branch/master)
 [![Coverage](https://codecov.io/gh/felixfbecker/php-language-server/branch/master/graph/badge.svg)](https://codecov.io/gh/felixfbecker/php-language-server)
 [![Dependency Status](https://gemnasium.com/badges/github.com/felixfbecker/php-language-server.svg)](https://gemnasium.com/github.com/felixfbecker/php-language-server)
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
diff --git a/appveyor.yml b/appveyor.yml
new file mode 100644
index 0000000..13dfd74
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,51 @@
+version: '{build}'
+
+platform:
+  - x64
+
+skip_tags: true
+skip_branch_with_pr: true
+clone_depth: 1
+max_jobs: 3
+
+cache:
+  - '%LOCALAPPDATA%\Composer'
+
+environment:
+  ANSICON: 121x90 (121x90)
+  matrix:
+    - { PHP_VERSION: '7.1.11', VC_VERSION: '14', XDEBUG_VERSION: '2.5.5' }
+
+install:
+  # Enable Windows Update service, needed to install vcredist2015 (dependency of php)
+  - ps: Set-Service wuauserv -StartupType Manual
+  - choco install -y php --version %PHP_VERSION%
+  - choco install -y composer
+  - refreshenv
+  - composer install --no-interaction --no-progress --prefer-dist
+  # Install XDebug for code coverage
+  - ps: |
+      $client = New-Object System.Net.WebClient
+      $phpMinorVersion = $env:PHP_VERSION -replace '\.\d+$'
+      $xdebugUrl = "https://xdebug.org/files/php_xdebug-$env:XDEBUG_VERSION-$phpMinorVersion-vc14-nts-x86_64.dll"
+      $phpDir = (Get-Item (Get-Command php).Source).Directory.FullName
+      $xdebugPath = Join-Path $phpDir ext\xdebug.dll
+      $client.DownloadFile($xdebugUrl, $xdebugPath)
+      $phpIniPath = Join-Path $phpDir php.ini
+      Add-Content $phpIniPath @"
+      zend_extension=$xdebugPath
+      "@
+
+build: off
+
+test_script:
+  - vendor\bin\phpunit --coverage-clover=coverage/coverage.xml
+
+after_test:
+  - ps: |
+      # Delete vendor because it causes problems with codecovs report search
+      # https://github.com/codecov/codecov-bash/issues/96
+      Remove-Item -Recurse -Force vendor
+      $env:PATH = 'C:\msys64\usr\bin;' + $env:PATH
+      Invoke-WebRequest -Uri 'https://codecov.io/bash' -OutFile codecov.sh
+      bash codecov.sh -f 'coverage/coverage.xml'
diff --git a/tests/Validation/ValidationTest.php b/tests/Validation/ValidationTest.php
index 3fc7429..9057c9d 100644
--- a/tests/Validation/ValidationTest.php
+++ b/tests/Validation/ValidationTest.php
@@ -96,7 +96,9 @@ class ValidationTest extends TestCase
         $testCasesDir = realpath(__DIR__ . '/cases');
         foreach ($refsAndDefs['references'] as $key => $list) {
             $fixedPathRefs = array_map(function ($ref) use ($testCasesDir) {
-                return str_replace($testCasesDir, '.', $ref);
+                $ref = str_replace($testCasesDir, '.', $ref);
+                $ref = str_replace(DIRECTORY_SEPARATOR, '/', $ref);
+                return $ref;
             }, $list);
 
             $refsAndDefs['references']->$key = $fixedPathRefs;
@@ -107,6 +109,7 @@ class ValidationTest extends TestCase
             if ($def !== null && $def->symbolInformation !== null &&
                 $def->symbolInformation->location !== null && $def->symbolInformation->location->uri !== null) {
                 $def->symbolInformation->location->uri = str_replace($testCasesDir, '.', $def->symbolInformation->location->uri);
+                $def->symbolInformation->location->uri = str_replace(DIRECTORY_SEPARATOR, '/', $def->symbolInformation->location->uri);
             }
         }