diff --git a/include/linux/mm.h b/include/linux/mm.h
index 83c651f25188e6671307e6886611563d4d17aa71..7ff54242c5d75d6144a23185b933b8201627f46a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -308,7 +308,7 @@ struct page {
  */
 #define get_page_testone(p)	atomic_inc_and_test(&(p)->_count)
 
-#define set_page_count(p,v) 	atomic_set(&(p)->_count, v - 1)
+#define set_page_count(p,v) 	atomic_set(&(p)->_count, (v) - 1)
 #define __put_page(p)		atomic_dec(&(p)->_count)
 
 extern void FASTCALL(__page_cache_release(struct page *));