diff --git a/scsh/dir-streams/interfaces.scm b/scsh/dir-streams/interfaces.scm
index 6986e4a..50b9a0b 100644
--- a/scsh/dir-streams/interfaces.scm
+++ b/scsh/dir-streams/interfaces.scm
@@ -4,6 +4,7 @@
 	  dir-stream-map
 	  dir-stream-filter
 	  dir-stream-filter-map
+	  dir-stream-fold-right
 	  fs-object-parent
 	  fs-object-name
 	  fs-object-info