diff --git a/po-properties/POTFILES.in b/po-properties/POTFILES.in
index aae1284d7e..b729d831e7 100644
--- a/po-properties/POTFILES.in
+++ b/po-properties/POTFILES.in
@@ -39,6 +39,7 @@ gtk/gtkappchooserbutton.c
 gtk/gtkappchooser.c
 gtk/gtkappchooserdialog.c
 gtk/gtkappchooserwidget.c
+gtk/gtkapplicationwindow.c
 gtk/gtkarrow.c
 gtk/gtkaspectframe.c
 gtk/gtkassistant.c