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-rw-r--r--src/os_unix.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/os_unix.c b/src/os_unix.c
index 3b33edc93..b0602ac2a 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -3180,8 +3180,8 @@ struct unixShm {
/*
** Constants used for locking
*/
-#define UNIX_SHM_BASE 81 /* Byte offset of the first lock byte */
-#define UNIX_SHM_DMS 80 /* The deadman switch lock */
+#define UNIX_SHM_BASE ((18+SQLITE_SHM_NLOCK)*4) /* first lock byte */
+#define UNIX_SHM_DMS (UNIX_SHM_BASE+SQLITE_SHM_NLOCK) /* deadman switch */
#ifdef SQLITE_DEBUG
/*