diff --git a/Tools/Replay/MsgHandler.h b/Tools/Replay/MsgHandler.h
index e8e9b55bc8..fff6303ae3 100644
--- a/Tools/Replay/MsgHandler.h
+++ b/Tools/Replay/MsgHandler.h
@@ -451,7 +451,7 @@ private:
 class MsgHandler_PARM : public MsgHandler
 {
 public:
-    MsgHandler_PARM(log_Format &_f, DataFlash_Class &_dataflash, uint64_t _last_timestamp_usec) : MsgHandler(_f, _dataflash, _last_timestamp_usec) {};
+    MsgHandler_PARM(log_Format &_f, DataFlash_Class &_dataflash, uint64_t &_last_timestamp_usec) : MsgHandler(_f, _dataflash, _last_timestamp_usec) {};
 
     virtual void process_message(uint8_t *msg);
 };