diff --git a/core/coreiface/coreiface/options/unixfs.go b/core/coreiface/coreiface/options/unixfs.go
index 3fd96f772c84..cd15991e27ad 100644
--- a/core/coreiface/coreiface/options/unixfs.go
+++ b/core/coreiface/coreiface/options/unixfs.go
@@ -39,7 +39,8 @@ type UnixfsAddSettings struct {
 }
 
 type UnixfsLsSettings struct {
-	ResolveChildren bool
+	ResolveChildren   bool
+	UseCumulativeSize bool
 }
 
 type UnixfsAddOption func(*UnixfsAddSettings) error
@@ -283,3 +284,10 @@ func (unixfsOpts) ResolveChildren(resolve bool) UnixfsLsOption {
 		return nil
 	}
 }
+
+func (unixfsOpts) UseCumulativeSize(use bool) UnixfsLsOption {
+	return func(settings *UnixfsLsSettings) error {
+		settings.UseCumulativeSize = use
+		return nil
+	}
+}