diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index df1c359..e596525 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -122,8 +122,8 @@
  * unique.
  */
 #define iterate_chain_key(key1, key2) \
-	(((key1) << MAX_LOCKDEP_KEYS_BITS/2) ^ \
-	((key1) >> (64-MAX_LOCKDEP_KEYS_BITS/2)) ^ \
+	(((key1) << MAX_LOCKDEP_KEYS_BITS) ^ \
+	((key1) >> (64-MAX_LOCKDEP_KEYS_BITS)) ^ \
 	(key2))
 
 void lockdep_off(void)