diff --git a/ndn-cpp/c/transport/SocketTransport.h b/ndn-cpp/c/transport/SocketTransport.h
index a5e89f7..6973d19 100644
--- a/ndn-cpp/c/transport/SocketTransport.h
+++ b/ndn-cpp/c/transport/SocketTransport.h
@@ -34,6 +34,8 @@
 ndn_Error ndn_SocketTransport_receive
   (struct ndn_SocketTransport *self, unsigned char *buffer, unsigned int bufferLength, unsigned int *nBytes);
 
+ndn_Error ndn_SocketTransport_close(struct ndn_SocketTransport *self);
+
 #ifdef	__cplusplus
 }
 #endif