diff --git a/binarystore.hpp b/binarystore.hpp
index 068db5a..0fc316b 100644
--- a/binarystore.hpp
+++ b/binarystore.hpp
@@ -25,7 +25,8 @@
     virtual std::string getBaseBlobId() const = 0;
     virtual std::vector<std::string> getBlobIds() const = 0;
     virtual bool canHandleBlob(const std::string& blobId) const = 0;
-    virtual bool openOrCreateBlob(const std::string& blobId) = 0;
+    virtual bool openOrCreateBlob(const std::string& blobId,
+                                  uint16_t flags) = 0;
     virtual std::vector<uint8_t> read(uint32_t offset,
                                       uint32_t requestedSize) = 0;
     virtual bool write(uint32_t offset, const std::vector<uint8_t>& data) = 0;