diff --git a/include/grgsm/misc_utils/extract_immediate_assignment.h b/include/grgsm/misc_utils/extract_immediate_assignment.h
index 361a9c3..ac8a630 100644
--- a/include/grgsm/misc_utils/extract_immediate_assignment.h
+++ b/include/grgsm/misc_utils/extract_immediate_assignment.h
@@ -48,7 +48,7 @@
        * class. gsm::extract_immediate_assignment::make is the public interface for
        * creating new instances.
        */
-      static sptr make(bool print_immediate_assignments=false, bool ignore_gprs=false);
+      static sptr make(bool print_immediate_assignments=false, bool ignore_gprs=false, bool unique_references=false);
       virtual std::vector<int> get_frame_numbers() = 0;
       virtual std::vector<std::string> get_channel_types() = 0;
       virtual std::vector<int> get_timeslots() = 0;