diff --git a/src/hash-helper.h b/src/hash-helper.h
index ab93697..41a8b8a 100644
--- a/src/hash-helper.h
+++ b/src/hash-helper.h
@@ -137,6 +137,9 @@
     return m_length;
   }
 
+  std::string
+  shortHash () const;
+
 private:
   unsigned char *m_buf;
   unsigned int m_length;