diff --git a/mm/slab.h b/mm/slab.h
index 5969769..dedb1a9 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -462,4 +462,6 @@
 void slab_stop(struct seq_file *m, void *p);
 int memcg_slab_show(struct seq_file *m, void *p);
 
+void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr);
+
 #endif /* MM_SLAB_H */