diff --git a/ndn-cpp/encoding/binary-xml-element-reader.cpp b/ndn-cpp/encoding/binary-xml-element-reader.cpp
index bfb9a2a..559af7f 100644
--- a/ndn-cpp/encoding/binary-xml-element-reader.cpp
+++ b/ndn-cpp/encoding/binary-xml-element-reader.cpp
@@ -9,7 +9,7 @@
 namespace ndn {
 
 void 
-ElementListener::staticOnReceivedElement(struct ndn_ElementListener *self, uint8_t *element, unsigned int elementLength)
+ElementListener::staticOnReceivedElement(struct ndn_ElementListener *self, uint8_t *element, size_t elementLength)
 {
   ((ElementListener *)self)->onReceivedElement(element, elementLength);
 }