diff --git a/po-properties/POTFILES.in b/po-properties/POTFILES.in
index 53cb8d4e29..5a64c798a5 100644
--- a/po-properties/POTFILES.in
+++ b/po-properties/POTFILES.in
@@ -287,6 +287,7 @@ gtk/gtktoolitem.c
 gtk/gtktoolitemgroup.c
 gtk/gtktoolpalette.c
 gtk/gtktoolshell.c
+gtk/gtktooltipwindow.c
 gtk/gtktrashmonitor.c
 gtk/gtktreednd.c
 gtk/gtktreemenu.c
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 6c22b10ecb..e26bdcf0c3 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -289,6 +289,7 @@ gtk/gtktoolitem.c
 gtk/gtktoolitemgroup.c
 gtk/gtktoolpalette.c
 gtk/gtktoolshell.c
+gtk/gtktooltipwindow.c
 gtk/gtktrashmonitor.c
 gtk/gtktreednd.c
 gtk/gtktreemenu.c