diff --git a/rust/treedirstate/src/filestore.rs b/rust/treedirstate/src/filestore.rs
--- a/rust/treedirstate/src/filestore.rs
+++ b/rust/treedirstate/src/filestore.rs
@@ -152,7 +152,9 @@
     }
 
     fn flush(&mut self) -> Result<()> {
-        self.file.get_mut().flush()?;
+        let file = self.file.get_mut();
+        file.flush()?;
+        file.get_mut().sync_data()?;
         Ok(())
     }
 }