diff --git a/sys/include/event.h b/sys/include/event.h
index ff77559127..7a72208d3e 100644
--- a/sys/include/event.h
+++ b/sys/include/event.h
@@ -81,7 +81,7 @@
  *
  * static custom_event_t custom_event = { .super.handler = custom_handler, .text = "CUSTOM EVENT" };
  *
- * [...] event_post(&queue, &custom_event)
+ * [...] event_post(&queue, (event_t *)&custom_event)
  * ~~~~~~~~~~~~~~~~~~~~~~~~
  *
  * @{