diff --git a/proto/anki/stats.proto b/proto/anki/stats.proto
index d664dd78c..d1f1df1d6 100644
--- a/proto/anki/stats.proto
+++ b/proto/anki/stats.proto
@@ -192,4 +192,5 @@ message RevlogEntry {
 
 message RevlogEntries {
   repeated RevlogEntry entries = 1;
-}
\ No newline at end of file
+  int64 next_day_at = 2;
+}
diff --git a/rslib/src/scheduler/fsrs/weights.rs b/rslib/src/scheduler/fsrs/weights.rs
index 9b58aa654..1894ad4ee 100644
--- a/rslib/src/scheduler/fsrs/weights.rs
+++ b/rslib/src/scheduler/fsrs/weights.rs
@@ -88,7 +88,11 @@ impl Collection {
             return Err(AnkiError::FsrsInsufficientData);
         }
         let entries = entries.into_iter().map(revlog_entry_to_proto).collect_vec();
-        let entries = RevlogEntries { entries };
+        let next_day_at = self.timing_today()?.next_day_at.0;
+        let entries = RevlogEntries {
+            entries,
+            next_day_at,
+        };
         let data = entries.encode_to_vec();
         write_file(target_path, data)?;
         Ok(())