diff --git a/lib/rb/lib/thrift/transport/memory_buffer_transport.rb b/lib/rb/lib/thrift/transport/memory_buffer_transport.rb
index b4a80f8..3169b2b 100644
--- a/lib/rb/lib/thrift/transport/memory_buffer_transport.rb
+++ b/lib/rb/lib/thrift/transport/memory_buffer_transport.rb
@@ -88,9 +88,9 @@
           out << ">"
         end
       
-        out << @buf[idx].to_s(16)
+        out << @buf[idx].ord.to_s(16)
       end
       out.join(" ")
     end
   end
-end
\ No newline at end of file
+end