diff --git a/include/grgsm/receiver/clock_offset_control.h b/include/grgsm/receiver/clock_offset_control.h
index 981c0dc..9a96d9c 100644
--- a/include/grgsm/receiver/clock_offset_control.h
+++ b/include/grgsm/receiver/clock_offset_control.h
@@ -36,7 +36,7 @@
      * \ingroup gsm
      *
      */
-    class GSM_API clock_offset_control : virtual public gr::block
+    class GRGSM_API clock_offset_control : virtual public gr::block
     {
      public:
       typedef boost::shared_ptr<clock_offset_control> sptr;
diff --git a/include/grgsm/receiver/cx_channel_hopper.h b/include/grgsm/receiver/cx_channel_hopper.h
index c8c2787..99a65c7 100644
--- a/include/grgsm/receiver/cx_channel_hopper.h
+++ b/include/grgsm/receiver/cx_channel_hopper.h
@@ -36,7 +36,7 @@
      * \ingroup gsm
      *
      */
-    class GSM_API cx_channel_hopper : virtual public gr::block
+    class GRGSM_API cx_channel_hopper : virtual public gr::block
     {
      public:
       typedef boost::shared_ptr<cx_channel_hopper> sptr;
diff --git a/include/grgsm/receiver/receiver.h b/include/grgsm/receiver/receiver.h
index 25509d2..97297ca 100644
--- a/include/grgsm/receiver/receiver.h
+++ b/include/grgsm/receiver/receiver.h
@@ -38,7 +38,7 @@
      * \ingroup gsm
      *
      */
-    class GSM_API receiver : virtual public sync_block
+    class GRGSM_API receiver : virtual public sync_block
     {
      public:
       typedef boost::shared_ptr<receiver> sptr;