diff --git a/sys/include/net/gnrc/mac/types.h b/sys/include/net/gnrc/mac/types.h
index 433d85b197..1c6a0ceb8b 100644
--- a/sys/include/net/gnrc/mac/types.h
+++ b/sys/include/net/gnrc/mac/types.h
@@ -43,9 +43,7 @@ extern "C" {
 /**
  * @brief   MAC message type for getting radio's duty-cycle.
  */
-#ifndef GNRC_MAC_TYPE_GET_DUTYCYCLE
 #define GNRC_MAC_TYPE_GET_DUTYCYCLE      (0x4401)
-#endif
 
 /**
  * @brief definition for device transmission feedback types