diff --git a/include/grgsm/demapping/universal_ctrl_chans_demapper.h b/include/grgsm/demapping/universal_ctrl_chans_demapper.h
index eea2bde..34bcafd 100644
--- a/include/grgsm/demapping/universal_ctrl_chans_demapper.h
+++ b/include/grgsm/demapping/universal_ctrl_chans_demapper.h
@@ -36,7 +36,7 @@
      * \ingroup gsm
      *
      */
-    class GSM_API universal_ctrl_chans_demapper : virtual public gr::block
+    class GRGSM_API universal_ctrl_chans_demapper : virtual public gr::block
     {
      public:
       typedef boost::shared_ptr<universal_ctrl_chans_demapper> sptr;