diff --git a/lib/misc_utils/bursts_printer_impl.h b/lib/misc_utils/bursts_printer_impl.h
index 21ca62e..5655920 100644
--- a/lib/misc_utils/bursts_printer_impl.h
+++ b/lib/misc_utils/bursts_printer_impl.h
@@ -34,8 +34,9 @@
      private:
       void bursts_print(pmt::pmt_t burst);
       pmt::pmt_t d_prepend_string;
+      bool d_prepend_fnr;
      public:
-      bursts_printer_impl(pmt::pmt_t prepend_string);
+      bursts_printer_impl(pmt::pmt_t prepend_string, bool prepend_fnr=false);
       ~bursts_printer_impl();
     };