diff --git a/distrib/scripts/manifests/gtk.rsp b/distrib/scripts/manifests/gtk.rsp
index 275388c728..1f906c2d5a 100644
--- a/distrib/scripts/manifests/gtk.rsp
+++ b/distrib/scripts/manifests/gtk.rsp
@@ -9,6 +9,7 @@ docs/gtk/makewxgtk
 include/wx/gtk/*.h
 include/wx/gtk/*.xpm
 include/wx/gtk/gnome/*.h
+include/wx/gtk/private/*.h
 
 include/wx/mac/corefoundation/*.h
 src/mac/corefoundation/*.cpp
diff --git a/distrib/scripts/manifests/x11.rsp b/distrib/scripts/manifests/x11.rsp
index e8937008b5..f4b6bc90c3 100644
--- a/distrib/scripts/manifests/x11.rsp
+++ b/distrib/scripts/manifests/x11.rsp
@@ -10,6 +10,7 @@ src/x11/*.inc
 src/x11/*.xbm
 
 include/wx/x11/*.h
+include/wx/gtk/private/string.h
 include/wx/x11/nanox/X11/*.h
 
 include/wx/mac/corefoundation/*.h