diff --git a/ndn-cpp/c/encoding/binary-xml-encoder.h b/ndn-cpp/c/encoding/binary-xml-encoder.h
index ba67e8f..5ebd4ac 100644
--- a/ndn-cpp/c/encoding/binary-xml-encoder.h
+++ b/ndn-cpp/c/encoding/binary-xml-encoder.h
@@ -32,7 +32,7 @@
  */
 static inline void ndn_BinaryXmlEncoder_init
   (struct ndn_BinaryXmlEncoder *self, unsigned char *outputArray, unsigned int outputArrayLength, 
-   unsigned char * (*reallocFunction)(unsigned char *, unsigned int)) 
+   unsigned char * (*reallocFunction)(struct ndn_DynamicUCharArray *self, unsigned char *, unsigned int)) 
 {
   ndn_DynamicUCharArray_init(&self->output, outputArray, outputArrayLength, reallocFunction);
   self->offset = 0;