diff --git a/lib/rex/parser/fs/ntfs.rb b/lib/rex/parser/fs/ntfs.rb
index 1dd7e049c8..99f49d2ede 100644
--- a/lib/rex/parser/fs/ntfs.rb
+++ b/lib/rex/parser/fs/ntfs.rb
@@ -181,7 +181,7 @@ module Rex
 
             data = ""
             while data.length < size_wanted
-              data += @file_handler.read(size_wanted - data.length)
+              data << @file_handler.read(size_wanted - data.length)
             end
             attribut += data
           end