diff --git a/sys/include/embUnit.h b/sys/include/embUnit.h
index ede21d7e75..1dabde9791 100644
--- a/sys/include/embUnit.h
+++ b/sys/include/embUnit.h
@@ -7,8 +7,8 @@
  */
 
 /**
- * @addtogroup unittests
- * @addtogroup sys
+ * @defgroup unittests Unittests
+ * @ingroup  sys
  * @{
  *
  * @file