diff --git a/internal/objectstorage/posix/posix.go b/internal/objectstorage/posix/posix.go
index 8a4201d..3364a03 100644
--- a/internal/objectstorage/posix/posix.go
+++ b/internal/objectstorage/posix/posix.go
@@ -73,7 +73,7 @@ func (s *PosixStorage) Stat(p string) (*types.ObjectInfo, error) {
 		return nil, err
 	}
 
-	return &types.ObjectInfo{Path: p, LastModified: fi.ModTime()}, nil
+	return &types.ObjectInfo{Path: p, LastModified: fi.ModTime(), Size: fi.Size()}, nil
 }
 
 func (s *PosixStorage) ReadObject(p string) (types.ReadSeekCloser, error) {
@@ -219,7 +219,7 @@ func (s *PosixStorage) List(prefix, startWith, delimiter string, doneCh <-chan s
 			if strings.HasPrefix(p, prefix) && p > startWith {
 				select {
 				// Send object content.
-				case objectCh <- types.ObjectInfo{Path: p, LastModified: info.ModTime()}:
+				case objectCh <- types.ObjectInfo{Path: p, LastModified: info.ModTime(), Size: info.Size()}:
 				// If receives done from the caller, return here.
 				case <-doneCh:
 					return io.EOF
diff --git a/internal/objectstorage/posixflat/posixflat.go b/internal/objectstorage/posixflat/posixflat.go
index d3e4a7c..cdcdd6e 100644
--- a/internal/objectstorage/posixflat/posixflat.go
+++ b/internal/objectstorage/posixflat/posixflat.go
@@ -249,7 +249,7 @@ func (s *PosixFlatStorage) Stat(p string) (*types.ObjectInfo, error) {
 		return nil, err
 	}
 
-	return &types.ObjectInfo{Path: p, LastModified: fi.ModTime()}, nil
+	return &types.ObjectInfo{Path: p, LastModified: fi.ModTime(), Size: fi.Size()}, nil
 }
 
 func (s *PosixFlatStorage) ReadObject(p string) (types.ReadSeekCloser, error) {
@@ -416,7 +416,7 @@ func (s *PosixFlatStorage) List(prefix, startWith, delimiter string, doneCh <-ch
 				if p > prevp {
 					select {
 					// Send object content.
-					case objectCh <- types.ObjectInfo{Path: p, LastModified: info.ModTime()}:
+					case objectCh <- types.ObjectInfo{Path: p, LastModified: info.ModTime(), Size: info.Size()}:
 					// If receives done from the caller, return here.
 					case <-doneCh:
 						return io.EOF
diff --git a/internal/objectstorage/s3/s3.go b/internal/objectstorage/s3/s3.go
index 4d47825..06b28bd 100644
--- a/internal/objectstorage/s3/s3.go
+++ b/internal/objectstorage/s3/s3.go
@@ -72,7 +72,7 @@ func (s *S3Storage) Stat(p string) (*types.ObjectInfo, error) {
 		return nil, merr
 	}
 
-	return &types.ObjectInfo{Path: p, LastModified: oi.LastModified}, nil
+	return &types.ObjectInfo{Path: p, LastModified: oi.LastModified, Size: oi.Size}, nil
 }
 
 func (s *S3Storage) ReadObject(filepath string) (types.ReadSeekCloser, error) {
@@ -157,7 +157,7 @@ func (s *S3Storage) List(prefix, startWith, delimiter string, doneCh <-chan stru
 			for _, object := range result.Contents {
 				select {
 				// Send object content.
-				case objectCh <- types.ObjectInfo{Path: object.Key, LastModified: object.LastModified}:
+				case objectCh <- types.ObjectInfo{Path: object.Key, LastModified: object.LastModified, Size: object.Size}:
 				// If receives done from the caller, return here.
 				case <-doneCh:
 					return
diff --git a/internal/objectstorage/types/types.go b/internal/objectstorage/types/types.go
index cd11a90..7911bbb 100644
--- a/internal/objectstorage/types/types.go
+++ b/internal/objectstorage/types/types.go
@@ -33,9 +33,9 @@ type ReadSeekCloser interface {
 }
 
 type ObjectInfo struct {
-	Path string
-
+	Path         string
 	LastModified time.Time
+	Size         int64
 
 	Err error
 }