diff --git a/include/sxmp/sxmp.h b/include/sxmp/sxmp.h
index 49aced3..10974c9 100644
--- a/include/sxmp/sxmp.h
+++ b/include/sxmp/sxmp.h
@@ -429,7 +429,7 @@ int sxmp_rpclist_filter(usrtc_t *source, usrtc_t **dest, int flag, int *filter);
 
 #define blub(txt)  fprintf(stderr, "%s:%d in %s > %s\n", __FILE__, __LINE__, __FUNCTION__, txt)
 
-#define dumphead(head) fprintf(stderr, "id: %d, opcode: %d, attr: %d, len = %d\n", head->msgid, head->opcode, head->attr, head->payload_length)
+#define dumphead(head) fprintf(stderr, "id: %d, opcode: %d, attr: %d, len = %d, reserve: %d\n", (head)->msgid, (head)->opcode, (head)->attr, (head)->payload_length, (head)->reserve)
 
 #endif /* __SXMP_SXMPLV2_H__ */