diff --git a/seaweed-volume/src/storage/erasure_coding/ec_volume.rs b/seaweed-volume/src/storage/erasure_coding/ec_volume.rs
index a746beca3..ff3973f20 100644
--- a/seaweed-volume/src/storage/erasure_coding/ec_volume.rs
+++ b/seaweed-volume/src/storage/erasure_coding/ec_volume.rs
@@ -178,11 +178,15 @@ impl EcVolume {
         format!("{}.ecj", self.idx_base_name())
     }
 
-    /// Sync the EC volume's journal file to disk (matching Go's ecv.SyncToDisk()).
+    /// Sync the EC volume's journal and index files to disk (matching Go's ecv.Sync()).
+    /// Go flushes both .ecj and .ecx to ensure in-place deletion marks are persisted.
     pub fn sync_to_disk(&self) -> io::Result<()> {
         if let Some(ref ecj_file) = self.ecj_file {
             ecj_file.sync_all()?;
         }
+        if let Some(ref ecx_file) = self.ecx_file {
+            ecx_file.sync_all()?;
+        }
         Ok(())
     }