diff --git a/src/AzureStorageServiceProvider.php b/src/AzureStorageServiceProvider.php
index a1dce73..6263b7d 100644
--- a/src/AzureStorageServiceProvider.php
+++ b/src/AzureStorageServiceProvider.php
@@ -51,7 +51,7 @@ public function boot()
                 (string)$config['container'],
                 isset($config['key']) ? (string)$config['key'] : null,
                 isset($config['url']) ? (string)$config['url'] : null,
-                isset($config['prefix']) ? (string)$config['url'] : 'prefix',
+                isset($config['prefix']) ? (string)$config['prefix'] : 'prefix',
             );
 
             return new FilesystemAdapter(