diff --git a/sample/Makefile.in b/sample/Makefile.in
index 448e2de3f..a6566d049 100755
--- a/sample/Makefile.in
+++ b/sample/Makefile.in
@@ -12,7 +12,7 @@ gtk-hello-world.exe: HelloWorld.cs
 	$(MCS) --unsafe -o gtk-hello-world.exe -L ../glib -L ../pango -L ../atk -L ../gdk -L ../gtk -r glib-sharp -r pango-sharp -r atk-sharp -r gdk-sharp -r gtk-sharp HelloWorld.cs
 
 button.exe: ButtonApp.cs
-	$(MCS) --unsafe -o button.exe -L ../glib -L ../pango -L ../atk -L ../gdk -L ../gtk -r glib-sharp -r pango-sharp -r atk-sharp -r gdk-sharp -r gtk-sharp ButtonApp.cs
+	$(MCS) --unsafe -o button.exe -L ../glib -L ../pango -L ../atk -L ../gdk -L ../gtk -r glib-sharp -r pango-sharp -r atk-sharp -r gdk-sharp -r gtk-sharp -r System.Drawing ButtonApp.cs
 
 clean:
 	rm -f *.exe