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-rw-r--r--services/sync/modules/engines.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/services/sync/modules/engines.js b/services/sync/modules/engines.js
index 35e8d6954..8fce34ff7 100644
--- a/services/sync/modules/engines.js
+++ b/services/sync/modules/engines.js
@@ -1250,7 +1250,7 @@ SyncEngine.prototype = {
// because some state may change during the course of this function and we
// need to operate on the original values.
let existsLocally = this._store.itemExists(item.id);
- let locallyModified = this._modified.has(item.id);
+ let locallyModified = item.id in this._modified;
// TODO Handle clock drift better. Tracked in bug 721181.
let remoteAge = AsyncResource.serverTime - item.modified;