diff --git a/composer.json b/composer.json
index c546e114..ccc81ca2 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
     "require-dev": {
         "phpunit/phpunit": "4.8.*",
         "johnkary/phpunit-speedtrap": "^1.0",
-        "mikey179/vfsStream": "~1.6",
+        "mikey179/vfsstream": "~1.6",
         "phploc/phploc": "2.*",
         "sebastian/phpcpd": "2.*",
         "phpdocumentor/reflection-docblock": "^2.0"