     }
 
     /// The group ID of the owner of the file at the path.
-    public var groupID: CUnsignedLong? {
+    public var groupID: UInt? {
         if let value = attributes[NSFileGroupOwnerAccountID] as? NSNumber {
             return value.unsignedLongValue
         }

    }

    /// The number of hard links to a file.
    public var fileReferenceCount: CUnsignedLong? {
        if let value = attributes[NSFileReferenceCount] as? NSNumber {
            return value.unsignedLongValue
        }

    }

    /// The filesystem number of the file at the path.
    public var filesystemFileNumber: UInt? {
        if let value = attributes[NSFileSystemFileNumber] as? NSNumber {
            return value.unsignedLongValue
        }
