diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 6b26f9d..53fd44d 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1042,7 +1042,7 @@
 EXPORT_SYMBOL(radix_tree_tagged);
 
 static void
-radix_tree_node_ctor(void *node, struct kmem_cache *cachep, unsigned long flags)
+radix_tree_node_ctor(struct kmem_cache *cachep, void *node)
 {
 	memset(node, 0, sizeof(struct radix_tree_node));
 }