diff --git a/ndn-cpp/transport/udp-transport.hpp b/ndn-cpp/transport/udp-transport.hpp
index 3ea1703..b2374df 100644
--- a/ndn-cpp/transport/udp-transport.hpp
+++ b/ndn-cpp/transport/udp-transport.hpp
@@ -74,7 +74,7 @@
    * @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);
 
   /**
    * Process any data to receive.  For each element received, call elementListener.onReceivedElement.