diff --git a/src/internal-packages.lisp b/src/internal-packages.lisp
index 26b5331e7..fb992c1f5 100644
--- a/src/internal-packages.lisp
+++ b/src/internal-packages.lisp
@@ -365,7 +365,9 @@
    :side-window
    :side-window-p
    :make-leftside-window
-   :delete-leftside-window)
+   :delete-leftside-window
+   :make-rightside-window
+   :delete-rightside-window)
   ;; popup.lisp
   (:export
    :*default-popup-message-timeout*