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-rw-r--r--tests/unit/test-bdrv-drain.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/unit/test-bdrv-drain.c b/tests/unit/test-bdrv-drain.c
index 4924ceb562..84e09d7070 100644
--- a/tests/unit/test-bdrv-drain.c
+++ b/tests/unit/test-bdrv-drain.c
@@ -1970,6 +1970,7 @@ static void coroutine_fn bdrv_replace_test_co_drain_end(BlockDriverState *bs)
static BlockDriver bdrv_replace_test = {
.format_name = "replace_test",
.instance_size = sizeof(BDRVReplaceTestState),
+ .supports_backing = true,
.bdrv_close = bdrv_replace_test_close,
.bdrv_co_preadv = bdrv_replace_test_co_preadv,