diff --git a/appveyor.yml b/appveyor.yml
index 7f56ee7..462d0fb 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -32,7 +32,14 @@ install:
   - cd c:\projects\amphp
   - appveyor DownloadFile https://getcomposer.org/composer.phar
   - php composer.phar install --prefer-dist --no-progress
+  - php composer.phar require satooshi/php-coveralls dev-master
+
+# https://ci.appveyor.com/tools/encrypt
+environment:
+  COVERALLS_REPO_TOKEN:
+    secure: bptM5yHwiBe6iQvBP769zMJa3nXikraEbWEuSOQ/rnl8fb0EgB6F7uQarfNXv5T0
 
 test_script:
   - cd c:\projects\amphp
-  - vendor/bin/phpunit --colors=always
+  - phpdbg -qrr vendor/phpunit/phpunit/phpunit --colors=always --coverage-text --coverage-clover build/logs/clover.xml
+  - php vendor/bin/coveralls -v