diff --git a/phpcs/Dockerfile b/phpcs/Dockerfile
index 115944d..e5e3d46 100644
--- a/phpcs/Dockerfile
+++ b/phpcs/Dockerfile
@@ -13,4 +13,5 @@ RUN apt-get update \
     && rm -rf /var/lib/apt/lists/*
 
 RUN composer global require "squizlabs/php_codesniffer=*"
+RUN /root/.composer/vendor/bin/phpcs --config-set default_standard PSR2
 CMD ["/root/.composer/vendor/bin/phpcs", "/data"]