diff --git a/composer.json b/composer.json
index 2e7a9201..a2ce9625 100644
--- a/composer.json
+++ b/composer.json
@@ -64,6 +64,7 @@
             "rector"
         ],
         "mutation": [
+            "@putenv XDEBUG_MODE=off",
             "infection --threads=max --git-diff-lines"
         ],
         "doc": [