diff --git a/observe_nema.html b/observe_nema.html
index 5e6deb6..2a08fe2 100644
--- a/observe_nema.html
+++ b/observe_nema.html
@@ -451,8 +451,8 @@
               canvas.style.aspectRatio = video_aspect;
 
               canvas_draw.style.aspectRatio = video_aspect;
-              canvas_draw.width = canvas_draw.width*5;
               canvas_draw.height = canvas_draw.height*5;
+              canvas_draw.width = canvas_draw.height*video_aspect;
 
               streaming = true;
             }