diff --git a/src/bin/nydus-image/prefetch.rs b/src/bin/nydus-image/prefetch.rs
deleted file mode 100644
index bf9df542279..00000000000
--- a/src/bin/nydus-image/prefetch.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-use anyhow::{Context, Result};
-use nydus_api::ConfigV2;
-use nydus_builder::{BuildContext, ConversionType};
-use nydus_rafs::metadata::RafsSuper;
-use nydus_rafs::metadata::RafsVersion;
-use std::result::Result::Ok;
-use std::{path::Path, sync::Arc};
-
-pub fn update_ctx_from_bootstrap(
-    ctx: &mut BuildContext,
-    config: Arc<ConfigV2>,
-    bootstrap_path: &Path,
-) -> Result<RafsSuper> {
-    let (sb, _) = RafsSuper::load_from_file(bootstrap_path, config, false)?;
-
-    ctx.blob_features = sb
-        .superblock
-        .get_blob_infos()
-        .first()
-        .ok_or_else(|| anyhow!("No blob info found in superblock"))?
-        .features();
-
-    let config = sb.meta.get_config();
-    if config.is_tarfs_mode {
-        ctx.conversion_type = ConversionType::TarToRafs;
-    }
-
-    ctx.fs_version =
-        RafsVersion::try_from(sb.meta.version).context("Failed to get RAFS version")?;
-    ctx.compressor = config.compressor;
-    Ok(sb)
-}