diff --git a/externs/olx.js b/externs/olx.js
index b3564cd27f..7fc47e1e01 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -3881,7 +3881,7 @@ olx.render.ToContextOptions.prototype.size;
 /**
  * Pixel ratio (canvas pixel to css pixel ratio) for the canvas. Default
  * is the detected device pixel ratio.
- * @type {ol.Size|undefined}
+ * @type {number|undefined}
  * @api
  */
 olx.render.ToContextOptions.prototype.pixelRatio;