diff --git a/composer.json b/composer.json
index 5e6e5d2..a3445e3 100644
--- a/composer.json
+++ b/composer.json
@@ -35,6 +35,7 @@
       "phpcs ."
     ],
     "test": [
+      "@putenv XDEBUG_MODE=coverage",
       "phpunit"
     ],
     "coverage": [