diff --git a/src/libstrongswan/plugins/drbg/drbg_ctr.h b/src/libstrongswan/plugins/drbg/drbg_ctr.h
index 9e41a4e37..5450f7320 100644
--- a/src/libstrongswan/plugins/drbg/drbg_ctr.h
+++ b/src/libstrongswan/plugins/drbg/drbg_ctr.h
@@ -15,7 +15,7 @@
 
 /**
  * @defgroup drbg_ctr drbg_ctr
- * @{ @ingroup drbg
+ * @{ @ingroup drbg_p
  */
 
 #ifndef DRBG_CTR_H_
diff --git a/src/libstrongswan/plugins/drbg/drbg_hmac.h b/src/libstrongswan/plugins/drbg/drbg_hmac.h
index fafd24d6a..f816dca54 100644
--- a/src/libstrongswan/plugins/drbg/drbg_hmac.h
+++ b/src/libstrongswan/plugins/drbg/drbg_hmac.h
@@ -15,7 +15,7 @@
 
 /**
  * @defgroup drbg_hmac drbg_hmac
- * @{ @ingroup drbg
+ * @{ @ingroup drbg_p
  */
 
 #ifndef DRBG_HMAC_H_