diff --git a/pkg/cayenne-lpp/doc.txt b/pkg/cayenne-lpp/doc.txt
index 4420b5d20d..05f3377df4 100644
--- a/pkg/cayenne-lpp/doc.txt
+++ b/pkg/cayenne-lpp/doc.txt
@@ -1,7 +1,7 @@
 /**
  * @defgroup pkg_cayenne-lpp Cayenne Low Power Payload (LPP)
  * @ingroup  pkg
- * @ingroup  sys
+ * @ingroup  sys_serialization
  * @brief    Provides a RIOT support for Cayenne LPP format
  *
  * The Cayenne Low Power Payload (LPP) provides a convenient and easy way to