diff --git a/sys/sys/_eventhandler.h b/sys/sys/_eventhandler.h
index ce8ab253a445..2973bfb3b189 100644
--- a/sys/sys/_eventhandler.h
+++ b/sys/sys/_eventhandler.h
@@ -47,7 +47,7 @@ typedef struct eventhandler_entry	*eventhandler_tag;
  * to pre-define a symbol for the eventhandler list. This symbol can be used by
  * EVENTHANDLER_DIRECT_INVOKE, which has the advantage of not needing to do a
  * locked search of the global list of eventhandler lists. At least
- * EVENTHANDLER_LIST_DEFINE must be be used for EVENTHANDLER_DIRECT_INVOKE to
+ * EVENTHANDLER_LIST_DEFINE must be used for EVENTHANDLER_DIRECT_INVOKE to
  * work. EVENTHANDLER_LIST_DECLARE is only needed if the call to
  * EVENTHANDLER_DIRECT_INVOKE is in a different compilation unit from
  * EVENTHANDLER_LIST_DEFINE. If the events are even relatively high frequency
diff --git a/sys/sys/eventhandler.h b/sys/sys/eventhandler.h
index 864d6c7a3b8e..9e307ecc327c 100644
--- a/sys/sys/eventhandler.h
+++ b/sys/sys/eventhandler.h
@@ -93,7 +93,7 @@ struct eventhandler_list {
  * to pre-define a symbol for the eventhandler list. This symbol can be used by
  * EVENTHANDLER_DIRECT_INVOKE, which has the advantage of not needing to do a
  * locked search of the global list of eventhandler lists. At least
- * EVENTHANDLER_LIST_DEFINE must be be used for EVENTHANDLER_DIRECT_INVOKE to
+ * EVENTHANDLER_LIST_DEFINE must be used for EVENTHANDLER_DIRECT_INVOKE to
  * work. EVENTHANDLER_LIST_DECLARE is only needed if the call to
  * EVENTHANDLER_DIRECT_INVOKE is in a different compilation unit from
  * EVENTHANDLER_LIST_DEFINE. If the events are even relatively high frequency