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-rw-r--r--block/copy-before-write.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index b866e42271..9a0e2b69d9 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -503,7 +503,7 @@ static void cbw_close(BlockDriverState *bs)
     s->bcs = NULL;
 }
 
-BlockDriver bdrv_cbw_filter = {
+static BlockDriver bdrv_cbw_filter = {
     .format_name = "copy-before-write",
     .instance_size = sizeof(BDRVCopyBeforeWriteState),