diff --git a/yama/src/chunking.rs b/yama/src/chunking.rs
index 5950ac6..83daaf0 100644
--- a/yama/src/chunking.rs
+++ b/yama/src/chunking.rs
@@ -35,7 +35,7 @@ pub const FASTCDC_AVG: usize = 1024 * 1024;
 // 8 MiB
 pub const FASTCDC_MAX: usize = 8 * 1024 * 1024;
 
-pub trait ChunkSubmissionTarget {
+pub trait ChunkSubmissionTarget: Sync {
     fn submit(&self, chunk_id: ChunkId, chunk_data: &[u8]) -> anyhow::Result<()>;
 }
 
diff --git a/yama/src/operations/storing.rs b/yama/src/operations/storing.rs
index 3e0b380..d784fea 100644
--- a/yama/src/operations/storing.rs
+++ b/yama/src/operations/storing.rs
@@ -35,10 +35,10 @@ use crate::progress::ProgressTracker;
 use crate::tree::{create_uidgid_lookup_tables, differentiate_node_in_place};
 use std::collections::BTreeMap;
 
-pub fn store<RP: RawPile, PT: ProgressTracker>(
+pub fn store<CST: ChunkSubmissionTarget, PT: ProgressTracker>(
     root_path: &Path,
     root: &mut TreeNode,
-    pile: &Pile<RP>,
+    target: &CST,
     progress_bar: &mut PT,
     num_workers: u8,
 ) -> anyhow::Result<()> {
@@ -57,7 +57,7 @@ pub fn store<RP: RawPile, PT: ProgressTracker>(
             s.builder()
                 .name(format!("yama chunker {}", worker_num))
                 .spawn(move |_| {
-                    if let Err(e) = store_worker(root_path, pile, paths_recv, results_send) {
+                    if let Err(e) = store_worker(root_path, target, paths_recv, results_send) {
                         error!("[critical!] Storage worker {} FAILED: {:?}", worker_num, e);
                         critical_failures.fetch_add(1, Ordering::Relaxed);
                     }
@@ -252,7 +252,7 @@ pub fn store_fully<PT: ProgressTracker>(
         differentiate_node_in_place(&mut root_node, &parent_node.node)?;
     }
 
-    store(&root_dir, &mut root_node, &pile, progress_bar, num_workers)?;
+    store(&root_dir, &mut root_node, pile, progress_bar, num_workers)?;
 
     let mut uid_lookup = BTreeMap::new();
     let mut gid_lookup = BTreeMap::new();