diff --git a/libuavcan/include/uavcan/internal/transport/transfer.hpp b/libuavcan/include/uavcan/internal/transport/transfer.hpp
index 371376c9fe..29f7393f16 100644
--- a/libuavcan/include/uavcan/internal/transport/transfer.hpp
+++ b/libuavcan/include/uavcan/internal/transport/transfer.hpp
@@ -155,6 +155,7 @@ public:
     bool isLast()                  const { return last_frame_; }
 
     void makeLast() { last_frame_ = true; }
+    void setIndex(uint_fast8_t index) { frame_index_ = index; }
 
     bool isFirst() const { return frame_index_ == 0; }