diff --git a/mm/internal.h b/mm/internal.h
index 6ec2cea..a4942f9 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -672,4 +672,7 @@ int vmap_pages_range_noflush(unsigned long addr, unsigned long end,
 
 void vunmap_range_noflush(unsigned long start, unsigned long end);
 
+int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
+		      unsigned long addr, int page_nid, int *flags);
+
 #endif	/* __MM_INTERNAL_H */