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-rw-r--r--block/preallocate.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/preallocate.c b/block/preallocate.c
index 4d82125036..3d0f621003 100644
--- a/block/preallocate.c
+++ b/block/preallocate.c
@@ -535,7 +535,7 @@ static void preallocate_child_perm(BlockDriverState *bs, BdrvChild *c,
     }
 }
 
-BlockDriver bdrv_preallocate_filter = {
+static BlockDriver bdrv_preallocate_filter = {
     .format_name = "preallocate",
     .instance_size = sizeof(BDRVPreallocateState),