diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 49958cffbd8da91d4505a55ee5cbb9a353555c1b..6dc0334815f7f1243691ff714b175e2bc2b4dd54 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -531,7 +531,7 @@ struct pagemapread {
 #define PM_RESERVED_BITS    3
 #define PM_RESERVED_OFFSET  (64 - PM_RESERVED_BITS)
 #define PM_RESERVED_MASK    (((1LL<<PM_RESERVED_BITS)-1) << PM_RESERVED_OFFSET)
-#define PM_SPECIAL(nr)      (((nr) << PM_RESERVED_OFFSET) | PM_RESERVED_MASK)
+#define PM_SPECIAL(nr)      (((nr) << PM_RESERVED_OFFSET) & PM_RESERVED_MASK)
 #define PM_NOT_PRESENT      PM_SPECIAL(1LL)
 #define PM_SWAP             PM_SPECIAL(2LL)
 #define PM_END_OF_BUFFER    1