diff --git a/pre-commit.sh b/pre-commit.sh
index 6d95ccdc..ac5d8136 100755
--- a/pre-commit.sh
+++ b/pre-commit.sh
@@ -3,4 +3,6 @@
 
 ./vendor/bin/php-cs-fixer fix src/
 
+./vendor/bin/php-cs-fixer fix tests/
+
 ./vendor/bin/phpunit