diff --git a/block/block-backend.c b/block/block-backend.c
index adf592e867..e578a2d5e3 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -371,23 +371,6 @@ BlockDriverState *blk_bs(BlockBackend *blk)
     return blk->root ? blk->root->bs : NULL;
 }
 
-/*
- * Changes the BlockDriverState attached to @blk
- */
-void blk_set_bs(BlockBackend *blk, BlockDriverState *bs)
-{
-    bdrv_ref(bs);
-
-    if (blk->root) {
-        blk->root->bs->blk = NULL;
-        bdrv_root_unref_child(blk->root);
-    }
-    assert(bs->blk == NULL);
-
-    blk->root = bdrv_root_attach_child(bs, "root", &child_root);
-    bs->blk = blk;
-}
-
 /*
  * Return @blk's DriveInfo if any, else null.
  */
diff --git a/include/block/block_int.h b/include/block/block_int.h
index ba6e9ac696..a33b0de40b 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -704,8 +704,6 @@ BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
                                   const BdrvChildRole *child_role);
 void bdrv_root_unref_child(BdrvChild *child);
 
-void blk_set_bs(BlockBackend *blk, BlockDriverState *bs);
-
 void blk_dev_change_media_cb(BlockBackend *blk, bool load);
 bool blk_dev_has_removable_media(BlockBackend *blk);
 bool blk_dev_has_tray(BlockBackend *blk);