diff --git a/src/main/ruby/core/dir.rb b/src/main/ruby/core/dir.rb
index fb5ce837a7a9..177e48087086 100644
--- a/src/main/ruby/core/dir.rb
+++ b/src/main/ruby/core/dir.rb
@@ -216,7 +216,7 @@ def glob(pattern, flags=0, &block)
 
         total = matches.size
         while index < total
-          Truffle::Type.encode_string matches[index], enc
+          matches[index] = matches[index].encode(enc) unless matches[index].encoding == enc
           index += 1
         end
       end