diff --git a/html/js/mobile-automata.mjs b/html/js/mobile-automata.mjs
index d53235a..4389679 100644
--- a/html/js/mobile-automata.mjs
+++ b/html/js/mobile-automata.mjs
@@ -310,7 +310,7 @@ export function renderToCanvas(canvas, width, height, sn = 0, dn = 0) {
     }
   }
 
-  ctx.putImageData(img);
+  ctx.putImageData(img, 0, 0);
 
   function step() {
     // calculate new state