diff --git a/src/foo.m b/src/foo.m
index c0b33051c3a027ff503399f0c018b03c06659f81..099787ef657993d4c8cf07dcc54c194a4d8972a0 100644
--- a/src/foo.m
+++ b/src/foo.m
@@ -3,6 +3,8 @@
 clear all
 close all
 
+if exist('graphics_toolkit','file') graphics_toolkit('fltk') end
+
 x = -200:2:300;
 y = -200:2:300;
 [X, Y] = meshgrid(x,y);