diff --git a/changelog.txt b/changelog.txt
index 9e010baff..40f8e948e 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -23,6 +23,7 @@ Fixed
 +++++
 
  - ``H5Store.mode`` returns the file mode (#607).
+ - Formatting of JSON files now matches the changes from synced collections (#645).
 
 [1.7.0] -- 2021-06-08
 ---------------------
diff --git a/signac/synced_collections/backends/collection_json.py b/signac/synced_collections/backends/collection_json.py
index ce4caa65b..b64b841c8 100644
--- a/signac/synced_collections/backends/collection_json.py
+++ b/signac/synced_collections/backends/collection_json.py
@@ -251,7 +251,7 @@ def _load_from_resource(self):
     def _save_to_resource(self):
         """Write the data to JSON file."""
         # Serialize data
-        blob = json.dumps(self, cls=SyncedCollectionJSONEncoder).encode()
+        blob = json.dumps(self, cls=SyncedCollectionJSONEncoder, indent=2).encode()
         # When write_concern flag is set, we write the data into dummy file and then
         # replace that file with original file. We also enable this mode
         # irrespective of the write_concern flag if we're running in