diff --git a/src/ol/Image.js b/src/ol/Image.js
index 66602f03cb..71ee355408 100644
--- a/src/ol/Image.js
+++ b/src/ol/Image.js
@@ -136,6 +136,7 @@ class ImageWrapper extends ImageBase {
    */
   setImage(image) {
     this.image_ = image;
+    this.resolution = getHeight(this.extent) / this.image_.height;
   }
 
   /**