diff --git a/include/grgsm/flow_control/burst_timeslot_filter.h b/include/grgsm/flow_control/burst_timeslot_filter.h
index 00ee2c3..f23fcf7 100644
--- a/include/grgsm/flow_control/burst_timeslot_filter.h
+++ b/include/grgsm/flow_control/burst_timeslot_filter.h
@@ -34,7 +34,7 @@
      * \ingroup gsm
      *
      */
-    class GSM_API burst_timeslot_filter : virtual public gr::block
+    class GRGSM_API burst_timeslot_filter : virtual public gr::block
     {
      public:
       typedef boost::shared_ptr<burst_timeslot_filter> sptr;