diff --git a/Project/DownloadIfMissingFileProvider.cs b/Project/DownloadIfMissingFileProvider.cs
index 058b097..dbe6bd6 100644
--- a/Project/DownloadIfMissingFileProvider.cs
+++ b/Project/DownloadIfMissingFileProvider.cs
@@ -154,10 +154,10 @@ public override void Initialize(string name, NameValueCollection config)
 
             if (config.Get("UrlResolverUrl") != null)
             {
-                UrlResolverUrl = config.Get("UrlResolverUrl");
+                UrlResolverUrl = config.Get("UrlResolverUrl").ToLower();
             }
             else
-                UrlResolverUrl = DefaultUrl;
+                UrlResolverUrl = DefaultUrl.ToLower();
 
             if (Activated)
             {