diff --git a/composer.json b/composer.json
index 2abfd17578efafc29b7f932706b4300c165ac943..74ce1644636fb902bb7a7ccef63bfaf09bb47100 100755
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
 		"paragonie/random_compat": "Provides better randomness in PHP 5.x"
 	},
 	"require-dev": {
-		"mikey179/vfsStream": "1.1.*"
+		"mikey179/vfsstream": "1.1.*"
 	},
 	"repositories": {
 		"packagist": {