diff --git a/sys/net/crosslayer/ng_netreg/ng_netreg.c b/sys/net/crosslayer/ng_netreg/ng_netreg.c
index 8458b22631..b8fce22f75 100644
--- a/sys/net/crosslayer/ng_netreg/ng_netreg.c
+++ b/sys/net/crosslayer/ng_netreg/ng_netreg.c
@@ -124,6 +124,10 @@ ng_pktsnip_t *ng_netreg_hdr_build(ng_nettype_t type, ng_pktsnip_t *payload,
 #endif
 
         default:
+            (void)src;
+            (void)src_len;
+            (void)dst;
+            (void)dst_len;
             return NULL;
     }
 }