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-rw-r--r--src/os_unix.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/os_unix.c b/src/os_unix.c
index 501b1b769..ab657dc7b 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -4081,7 +4081,7 @@ static int unixShmSystemLock(
#ifdef SQLITE_DEBUG
{ u16 mask;
OSTRACE(("SHM-LOCK "));
- mask = (1<<(ofst+n)) - (1<<ofst);
+ mask = ofst>31 ? 0xffffffff : (1<<(ofst+n)) - (1<<ofst);
if( rc==SQLITE_OK ){
if( lockType==F_UNLCK ){
OSTRACE(("unlock %d ok", ofst));