diff --git a/ndn-cpp/transport/transport.hpp b/ndn-cpp/transport/transport.hpp
index 2f71096..ed3e240 100644
--- a/ndn-cpp/transport/transport.hpp
+++ b/ndn-cpp/transport/transport.hpp
@@ -37,10 +37,10 @@
    * @param dataLength The number of bytes in data.
    */
   virtual void 
-  send(const unsigned char *data, unsigned int dataLength);
+  send(const uint8_t *data, unsigned int dataLength);
   
   void 
-  send(const std::vector<unsigned char>& data)
+  send(const std::vector<uint8_t>& data)
   {
     send(&data[0], data.size());
   }