diff --git a/block/backup.c b/block/backup.c
index 83516297cb..4869f1e5da 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -452,7 +452,7 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
         goto error;
     }
 
-    cbw = bdrv_cbw_append(bs, target, filter_node_name, false, &bcs, errp);
+    cbw = bdrv_cbw_append(bs, target, filter_node_name, &bcs, errp);
     if (!cbw) {
         goto error;
     }
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 4858dcf8ff..1e7180760a 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -145,7 +145,7 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
 }
 
 static int cbw_init(BlockDriverState *bs, BlockDriverState *source,
-                    BlockDriverState *target, bool compress, Error **errp)
+                    BlockDriverState *target, Error **errp)
 {
     BDRVCopyBeforeWriteState *s = bs->opaque;
 
@@ -173,7 +173,7 @@ static int cbw_init(BlockDriverState *bs, BlockDriverState *source,
             ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
              bs->file->bs->supported_zero_flags);
 
-    s->bcs = block_copy_state_new(bs->file, s->target, false, compress, errp);
+    s->bcs = block_copy_state_new(bs->file, s->target, false, false, errp);
     if (!s->bcs) {
         error_prepend(errp, "Cannot create block-copy-state: ");
         return -EINVAL;
@@ -202,7 +202,6 @@ BlockDriver bdrv_cbw_filter = {
 BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
                                   BlockDriverState *target,
                                   const char *filter_node_name,
-                                  bool compress,
                                   BlockCopyState **bcs,
                                   Error **errp)
 {
@@ -221,7 +220,7 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
     }
     state = top->opaque;
 
-    ret = cbw_init(top, source, target, compress, errp);
+    ret = cbw_init(top, source, target, errp);
     if (ret < 0) {
         goto fail;
     }
diff --git a/block/copy-before-write.h b/block/copy-before-write.h
index b386fd8f01..51847e711a 100644
--- a/block/copy-before-write.h
+++ b/block/copy-before-write.h
@@ -32,7 +32,6 @@
 BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
                                   BlockDriverState *target,
                                   const char *filter_node_name,
-                                  bool compress,
                                   BlockCopyState **bcs,
                                   Error **errp);
 void bdrv_cbw_drop(BlockDriverState *bs);