diff --git a/src/backfill.rs b/src/backfill.rs
index e3ed6dd..31e6928 100644
--- a/src/backfill.rs
+++ b/src/backfill.rs
@@ -50,7 +50,9 @@ pub async fn backfill(
 
     // wait for the big backfill to finish
     while let Some(res) = workers.join_next().await {
-        res??;
+        res
+            .inspect_err(|e| log::error!("problem joining source workers: {e}"))?
+            .inspect_err(|e| log::error!("problem *from* source worker: {e}"))?;
     }
     log::info!("finished fetching backfill in {:?}", t_step.elapsed());
     Ok(())