diff --git a/internal/objectstorage/objectstorage.go b/internal/objectstorage/objectstorage.go
index a9dbce4..8e34370 100644
--- a/internal/objectstorage/objectstorage.go
+++ b/internal/objectstorage/objectstorage.go
@@ -17,6 +17,7 @@ package objectstorage
 import (
 	"errors"
 	"io"
+	"time"
 )
 
 // TODO(sgotti)
@@ -36,6 +37,8 @@ type Storage interface {
 type ObjectInfo struct {
 	Path string
 
+	LastModified time.Time
+
 	Err error
 }
 
diff --git a/internal/objectstorage/posix.go b/internal/objectstorage/posix.go
index 243c809..36a1baf 100644
--- a/internal/objectstorage/posix.go
+++ b/internal/objectstorage/posix.go
@@ -240,14 +240,15 @@ func (s *PosixStorage) Stat(p string) (*ObjectInfo, error) {
 		return nil, err
 	}
 
-	if _, err := os.Stat(fspath); err != nil {
+	fi, err := os.Stat(fspath)
+	if err != nil {
 		if os.IsNotExist(err) {
 			return nil, ErrNotExist
 		}
 		return nil, err
 	}
 
-	return &ObjectInfo{Path: p}, nil
+	return &ObjectInfo{Path: p, LastModified: fi.ModTime()}, nil
 }
 
 func (s *PosixStorage) ReadObject(p string) (io.ReadCloser, error) {
@@ -409,7 +410,7 @@ func (s *PosixStorage) List(prefix, startWith, delimiter string, doneCh <-chan s
 				if p > prevp {
 					select {
 					// Send object content.
-					case objectCh <- ObjectInfo{Path: p}:
+					case objectCh <- ObjectInfo{Path: p, LastModified: info.ModTime()}:
 					// If receives done from the caller, return here.
 					case <-doneCh:
 						return io.EOF
diff --git a/internal/objectstorage/s3.go b/internal/objectstorage/s3.go
index 6ec4455..5ffdf5c 100644
--- a/internal/objectstorage/s3.go
+++ b/internal/objectstorage/s3.go
@@ -61,7 +61,8 @@ func NewS3Storage(bucket, location, endpoint, accessKeyID, secretAccessKey strin
 }
 
 func (s *S3Storage) Stat(p string) (*ObjectInfo, error) {
-	if _, err := s.minioClient.StatObject(s.bucket, p, minio.StatObjectOptions{}); err != nil {
+	oi, err := s.minioClient.StatObject(s.bucket, p, minio.StatObjectOptions{})
+	if err != nil {
 		merr := minio.ToErrorResponse(err)
 		if merr.StatusCode == http.StatusNotFound {
 			return nil, ErrNotExist
@@ -69,7 +70,7 @@ func (s *S3Storage) Stat(p string) (*ObjectInfo, error) {
 		return nil, merr
 	}
 
-	return &ObjectInfo{Path: p}, nil
+	return &ObjectInfo{Path: p, LastModified: oi.LastModified}, nil
 }
 
 func (s *S3Storage) ReadObject(filepath string) (io.ReadCloser, error) {
@@ -144,7 +145,7 @@ func (s *S3Storage) List(prefix, startWith, delimiter string, doneCh <-chan stru
 			for _, object := range result.Contents {
 				select {
 				// Send object content.
-				case objectCh <- ObjectInfo{Path: object.Key}:
+				case objectCh <- ObjectInfo{Path: object.Key, LastModified: object.LastModified}:
 				// If receives done from the caller, return here.
 				case <-doneCh:
 					return