diff --git a/composer.json b/composer.json
index 5eadb966a..689dea3ea 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
 	"minimum-stability": "dev",
 	"scripts": {
 		"phpstan": "phpstan analyse",
-		"tester": "tester tests"
+		"tester": "tester -C tests"
 	},
 	"extra": {
 		"branch-alias": {