1 files changed, 3 insertions, 1 deletions
diff --git a/src/os_unix.c b/src/os_unix.c
index a15592ef3..f4c0570cc 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -4879,7 +4879,9 @@ static void unixShmBarrier(
 ){
   UNUSED_PARAMETER(fd);
   sqlite3MemoryBarrier();         /* compiler-defined memory barrier */
-  assert( unixFileMutexNotheld((unixFile*)fd) );
+  assert( fd->pMethods->xLock==nolockLock 
+       || unixFileMutexNotheld((unixFile*)fd) 
+  );
   unixEnterMutex();               /* Also mutex, for redundancy */
   unixLeaveMutex();
 }