diff --git a/sys/netgraph/ng_base.c b/sys/netgraph/ng_base.c
index f9e679de33bb..ac9d55a6f703 100644
--- a/sys/netgraph/ng_base.c
+++ b/sys/netgraph/ng_base.c
@@ -978,7 +978,7 @@ ng_unname(node_p node)
  * Allocate a bigger name hash.
  */
 static void
-ng_name_rehash()
+ng_name_rehash(void)
 {
 	struct nodehash *new;
 	uint32_t hash;
@@ -1009,7 +1009,7 @@ ng_name_rehash()
  * Allocate a bigger ID hash.
  */
 static void
-ng_ID_rehash()
+ng_ID_rehash(void)
 {
 	struct nodehash *new;
 	uint32_t hash;