diff --git a/tsdb/index/tsi1/partition.go b/tsdb/index/tsi1/partition.go
index e92b6a6292..bdd268eb01 100644
--- a/tsdb/index/tsi1/partition.go
+++ b/tsdb/index/tsi1/partition.go
@@ -1466,9 +1466,6 @@ func (m *Manifest) Write() (int64, error) {
 
 		tmp = f.Name()
 
-		if err = f.Chmod(0666); err != nil {
-			return fmt.Errorf("failed setting permissions on manifest file %q: %w", tmp, err)
-		}
 		if _, err = f.Write(buf); err != nil {
 			return fmt.Errorf("failed writing temporary manifest file %q: %w", tmp, err)
 		}