diff --git a/examples/graph2d/16_bothAxis_titles.html b/examples/graph2d/16_bothAxis_titles.html
index dbc86e78..fb12f461 100644
--- a/examples/graph2d/16_bothAxis_titles.html
+++ b/examples/graph2d/16_bothAxis_titles.html
@@ -172,7 +172,7 @@
             title = {text: "Title (" + axes + " axes)", style: "color: green;"};
         }
         else {
-            title = false;
+            title = undefined;
         }
 
         if(axes == 'left') {