diff --git a/src/backend/storage/lmgr/lwlock.c b/src/backend/storage/lmgr/lwlock.c
new file mode 100644
index 9179d1b..fd4b479
*** a/src/backend/storage/lmgr/lwlock.c
--- b/src/backend/storage/lmgr/lwlock.c
*************** extern slock_t *ShmemLock;
*** 107,113 ****
  
  #define LW_LOCK_MASK				((uint32) ((1 << 25)-1))
  /* Must be greater than MAX_BACKENDS - which is 2^23-1, so we're fine. */
! #define LW_SHARED_MASK				((uint32)(1 << 23))
  
  /*
   * This is indexed by tranche ID and stores metadata for all tranches known
--- 107,113 ----
  
  #define LW_LOCK_MASK				((uint32) ((1 << 25)-1))
  /* Must be greater than MAX_BACKENDS - which is 2^23-1, so we're fine. */
! #define LW_SHARED_MASK				((uint32) ((1 << 24)-1))
  
  /*
   * This is indexed by tranche ID and stores metadata for all tranches known