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-rw-r--r--block/mirror.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/mirror.c b/block/mirror.c
index 9019d1ba56..405616422b 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -378,7 +378,8 @@ static void coroutine_fn mirror_run(void *opaque)
int64_t sector_num, end, sectors_per_chunk, length;
uint64_t last_pause_ns;
BlockDriverInfo bdi;
- char backing_filename[1024];
+ char backing_filename[2]; /* we only need 2 characters because we are only
+ checking for a NULL string */
int ret = 0;
int n;