diff --git a/.circleci/config.yml b/.circleci/config.yml
index b0de96cf..d59c8d51 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2
 jobs:
     build_and_test:
         docker:
-            image: php:7.1
+            - image: php:7.1
         steps:
             - checkout
             - run: ./vendor/bin/phpunit