diff --git a/mm/internal.h b/mm/internal.h
index b2027c7..5a6761b 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -257,3 +257,4 @@
 extern u32 hwpoison_filter_dev_minor;
 extern u64 hwpoison_filter_flags_mask;
 extern u64 hwpoison_filter_flags_value;
+extern u64 hwpoison_filter_memcg;