diff --git a/include/gsm/get_bcch_or_ccch_bursts.h b/include/gsm/get_bcch_or_ccch_bursts.h
index d74137a..12f9dbc 100644
--- a/include/gsm/get_bcch_or_ccch_bursts.h
+++ b/include/gsm/get_bcch_or_ccch_bursts.h
@@ -46,7 +46,7 @@
        * class. gsm::get_bcch_or_ccch_bursts::make is the public interface for
        * creating new instances.
        */
-      static sptr make();
+      static sptr make(unsigned int fn51_start);
     };
 
   } // namespace gsm