diff --git a/game_fullscreen.html b/game_fullscreen.html
index 459455e..f057f8c 100644
--- a/game_fullscreen.html
+++ b/game_fullscreen.html
@@ -49,6 +49,7 @@
   <style>
     body {
 	overflow: hidden;
+	touch-action: none;
     }
     svg.graph {
 	border: 0px;