diff --git a/firmware_handler.hpp b/firmware_handler.hpp
index 3eede31..f5239b4 100644
--- a/firmware_handler.hpp
+++ b/firmware_handler.hpp
@@ -67,6 +67,8 @@
     bool stat(uint16_t session, struct BlobMeta* meta) override;
     bool expire(uint16_t session) override;
 
+    static const std::string hashBlobID;
+
   private:
     std::vector<std::string> blobIDs;
     std::uint32_t transports;