diff --git a/composer.json b/composer.json
index cf682ce..301413e 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         "silverstripe/framework": "~4.0"
     },
     "require-dev": {
-        "phpunit/PHPUnit": "^5.7"
+        "phpunit/phpunit": "^5.7"
     },
     "extra": {
         "expose": [