diff --git a/src/hash-helper.h b/src/hash-helper.h
index d4f750d..638a93a 100644
--- a/src/hash-helper.h
+++ b/src/hash-helper.h
@@ -37,6 +37,8 @@
 class Hash
 {
 public:
+  static unsigned char _origin;
+  static HashPtr Origin;
   Hash (const void *buf, unsigned int length)
     : m_length (length)
   {