diff --git a/po-properties/POTFILES.in b/po-properties/POTFILES.in
index 088c4db880..fd245e18be 100644
--- a/po-properties/POTFILES.in
+++ b/po-properties/POTFILES.in
@@ -91,6 +91,7 @@ gtk/gtkcellrendererspinner.c
 gtk/gtkcellrenderertext.c
 gtk/gtkcellrenderertoggle.c
 gtk/gtkcellview.c
+gtk/gtkcenterbox.c
 gtk/gtkcheckbutton.c
 gtk/gtkcheckmenuitem.c
 gtk/gtkclipboard.c