diff --git a/backend/s3/s3.go b/backend/s3/s3.go
index d0a2677ffce31..f924512577a80 100644
--- a/backend/s3/s3.go
+++ b/backend/s3/s3.go
@@ -5132,6 +5132,12 @@ func (o *Object) SetModTime(ctx context.Context, modTime time.Time) error {
 	if err != nil {
 		return err
 	}
+
+	// Do not copy to itself if metadata is already correct ?
+	if o.meta[metaMtime] == swift.TimeToFloatString(modTime) {
+		return nil
+	}
+
 	o.meta[metaMtime] = swift.TimeToFloatString(modTime)
 
 	// Can't update metadata here, so return this error to force a recopy