diff --git a/composer.json b/composer.json
index 3a1c4fdf..8ec09fc8 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
 		"silverstripe/comments": "^3.0"
 	},
 	"require-dev": {
-        "phpunit/PHPUnit": "^5.7",
+        "phpunit/phpunit": "^5.7",
         "squizlabs/php_codesniffer": "^3.0"
     },
     "autoload": {