diff --git a/libuavcan/include/uavcan/internal/transport/transfer_buffer.hpp b/libuavcan/include/uavcan/internal/transport/transfer_buffer.hpp
index efa3c876d3..0aca0377f8 100644
--- a/libuavcan/include/uavcan/internal/transport/transfer_buffer.hpp
+++ b/libuavcan/include/uavcan/internal/transport/transfer_buffer.hpp
@@ -201,6 +201,9 @@ public:
     }
 
     uint8_t* getRawPtr() { return data_; }
+    const uint8_t* getRawPtr() const { return data_; }
+
+    unsigned int getMaxWritePos() const { return max_write_pos_; }
     void setMaxWritePos(unsigned int value) { max_write_pos_ = value; }
 };