--- a/ui/wpf/objs.mk	Tue Jan 27 09:59:32 2015 +0100
+++ b/ui/wpf/objs.mk	Sat Jan 31 11:51:54 2015 +0100
@@ -32,6 +32,7 @@
 WPFOBJ = toolkit.o
 WPFOBJ += window.o
 WPFOBJ += menu.o
+WPFOBJ += button.o
 
 TOOLKITOBJS += $(WPFOBJ:%=$(WPF_OBJPRE)%)
 TOOLKITSOURCE += $(WPFOBJ:%.o=wpf/%.c)