diff --git a/rslib/src/sync/mod.rs b/rslib/src/sync/mod.rs
index 127cdf2cf..8a533d94c 100644
--- a/rslib/src/sync/mod.rs
+++ b/rslib/src/sync/mod.rs
@@ -103,6 +103,7 @@ pub struct UnchunkedChanges {
 
 #[derive(Serialize, Deserialize, Debug, Default)]
 pub struct Chunk {
+    #[serde(default)]
     done: bool,
     #[serde(skip_serializing_if = "Vec::is_empty", default)]
     revlog: Vec<RevlogEntry>,