diff --git a/ParcelKit/PKSyncManager.m b/ParcelKit/PKSyncManager.m
index 5bca7cf..561ab91 100644
--- a/ParcelKit/PKSyncManager.m
+++ b/ParcelKit/PKSyncManager.m
@@ -193,6 +193,7 @@ - (BOOL)updateCoreDataWithDatastoreChanges:(NSDictionary *)changes error:(NSErro
     
     NSManagedObjectContext *managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
     [managedObjectContext setPersistentStoreCoordinator:self.persistentStoreCoordinator];
+    [managedObjectContext setMergePolicy:NSMergeByPropertyObjectTrumpMergePolicy];
     [managedObjectContext setUndoManager:nil];
 
     __weak typeof(self) weakSelf = self;