--- a/crates/fleet-base/src/primops.rs
+++ b/crates/fleet-base/src/primops.rs
@@ -165,7 +165,7 @@
 					bail!("secret generator has produced an unexpected part: {part}");
 				};
 				let contents: SecretData = fs
-					.read_file_text(out.join("part"))
+					.read_file_text(out.join(&part))
 					.await?
 					.parse()
 					.map_err(|e| anyhow!("failed to decode secret {out:?} part {part:?}: {e}"))?;