diff --git a/libs/maps.js b/libs/maps.js
index 3c49178..e47e053 100644
--- a/libs/maps.js
+++ b/libs/maps.js
@@ -37,7 +37,7 @@ maps.prototype._resetFloorImages = function () {
 maps.prototype._setHDCanvasSize = function (ctx, width, height) {
     if (main.replayChecking) return
     ctx.setTransform(1, 0, 0, 1, 0, 0);
-    var ratio = core.domStyle.scale;
+    var ratio = core.domStyle.ratio;
     ratio *= devicePixelRatio;
     if (width != null) ctx.canvas.width = width * ratio;
     if (height != null) ctx.canvas.height = height * ratio;