diff --git a/composer.json b/composer.json
index e2e7859d2..c7243090e 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     "require-dev": {
         "jcalderonzumba/gastonjs": "~1.0.2",
         "jcalderonzumba/mink-phantomjs-driver": "~0.3.1",
-        "mikey179/vfsStream": "~1.2",
+        "mikey179/vfsstream": "~1.2",
         "symfony/css-selector": "~2.8",
         "behat/behat": "3.*@stable",
         "behat/mink": "1.*@stable",