diff --git a/ndn-cpp/encoding/binary-xml-encoder.hpp b/ndn-cpp/encoding/binary-xml-encoder.hpp
index cee590c..ad41a69 100644
--- a/ndn-cpp/encoding/binary-xml-encoder.hpp
+++ b/ndn-cpp/encoding/binary-xml-encoder.hpp
@@ -31,7 +31,7 @@
    * Resize the output vector to the correct encoding length and return.
    * @return The encoding as a shared_ptr.  Assume that the caller now owns the vector.
    */
-  const ptr_lib::shared_ptr<std::vector<unsigned char> > &getOutput() 
+  const ptr_lib::shared_ptr<std::vector<unsigned char> >& getOutput() 
   {
     output_.get()->resize(offset);
     return output_.get();