diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 038b6e7..ebf3750 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -183,9 +183,9 @@
 void hugepage_add_new_anon_rmap(struct page *, struct vm_area_struct *,
 				unsigned long);
 
-static inline void page_dup_rmap(struct page *page)
+static inline void page_dup_rmap(struct page *page, bool compound)
 {
-	atomic_inc(&page->_mapcount);
+	atomic_inc(compound ? compound_mapcount_ptr(page) : &page->_mapcount);
 }
 
 /*