diff --git a/ndn-cpp/c/encoding/BinaryXMLInterest.h b/ndn-cpp/c/encoding/BinaryXMLInterest.h
index 115fce2..2b23e0d 100644
--- a/ndn-cpp/c/encoding/BinaryXMLInterest.h
+++ b/ndn-cpp/c/encoding/BinaryXMLInterest.h
@@ -15,7 +15,7 @@
 
 char *ndn_encodeBinaryXMLInterest(struct ndn_Interest *interest, struct ndn_BinaryXMLEncoder *encoder);
 
-char *ndn_decodeBinaryXMLInterest(struct ndn_Interest *interest, unsigned char *input, unsigned int inputLength);
+char *ndn_decodeBinaryXMLInterest(struct ndn_Interest *interest, struct ndn_BinaryXMLDecoder *decoder);
 
 #ifdef	__cplusplus
 }