diff --git a/objstore.go b/objstore.go
index f6bcac6c..d201a6bf 100644
--- a/objstore.go
+++ b/objstore.go
@@ -284,6 +284,7 @@ type ObjectAttributes struct {
 
 type IterObjectAttributes struct {
 	Name         string
+	Size         int64
 	lastModified time.Time
 }
 
diff --git a/providers/azure/azure.go b/providers/azure/azure.go
index f3b891ec..91699baa 100644
--- a/providers/azure/azure.go
+++ b/providers/azure/azure.go
@@ -232,6 +232,7 @@ func (b *Bucket) IterWithAttributes(ctx context.Context, dir string, f func(attr
 			for _, blob := range resp.Segment.BlobItems {
 				attrs := objstore.IterObjectAttributes{
 					Name: *blob.Name,
+					Size: *blob.Properties.ContentLength,
 				}
 				if params.LastModified {
 					attrs.SetLastModified(*blob.Properties.LastModified)
diff --git a/providers/bos/bos.go b/providers/bos/bos.go
index be7a1b3c..2c783f7f 100644
--- a/providers/bos/bos.go
+++ b/providers/bos/bos.go
@@ -219,6 +219,7 @@ func (b *Bucket) IterWithAttributes(ctx context.Context, dir string, f func(attr
 		for _, object := range objects.Contents {
 			attrs := objstore.IterObjectAttributes{
 				Name: object.Key,
+				Size: int64(object.Size),
 			}
 
 			if params.LastModified && object.LastModified != "" {
diff --git a/providers/filesystem/filesystem.go b/providers/filesystem/filesystem.go
index 3717cf3d..7d350890 100644
--- a/providers/filesystem/filesystem.go
+++ b/providers/filesystem/filesystem.go
@@ -109,17 +109,17 @@ func (b *Bucket) IterWithAttributes(ctx context.Context, dir string, f func(attr
 				continue
 			}
 		}
+		finfo, err := file.Info()
+		if err != nil {
+			return errors.Wrapf(err, "stat %s", name)
+		}
 
 		attrs := objstore.IterObjectAttributes{
 			Name: name,
+			Size: finfo.Size(),
 		}
 		if params.LastModified {
-			absPath := filepath.Join(absDir, file.Name())
-			stat, err := os.Stat(absPath)
-			if err != nil {
-				return errors.Wrapf(err, "stat %s", name)
-			}
-			attrs.SetLastModified(stat.ModTime())
+			attrs.SetLastModified(finfo.ModTime())
 		}
 		if err := f(attrs); err != nil {
 			return err
diff --git a/providers/gcs/gcs.go b/providers/gcs/gcs.go
index b8723b8c..1250e145 100644
--- a/providers/gcs/gcs.go
+++ b/providers/gcs/gcs.go
@@ -244,7 +244,7 @@ func (b *Bucket) IterWithAttributes(ctx context.Context, dir string, f func(attr
 			return err
 		}
 
-		objAttrs := objstore.IterObjectAttributes{Name: attrs.Prefix + attrs.Name}
+		objAttrs := objstore.IterObjectAttributes{Name: attrs.Prefix + attrs.Name, Size: attrs.Size}
 		if appliedOpts.LastModified {
 			objAttrs.SetLastModified(attrs.Updated)
 		}
diff --git a/providers/s3/s3.go b/providers/s3/s3.go
index 5c8cd953..1eb4dcfb 100644
--- a/providers/s3/s3.go
+++ b/providers/s3/s3.go
@@ -430,6 +430,7 @@ func (b *Bucket) IterWithAttributes(ctx context.Context, dir string, f func(attr
 
 		attr := objstore.IterObjectAttributes{
 			Name: object.Key,
+			Size: object.Size,
 		}
 		if appliedOpts.LastModified {
 			attr.SetLastModified(object.LastModified)