diff --git a/src/ol/format/IIIFInfo.js b/src/ol/format/IIIFInfo.js
index 064333ad1b..ded0a658df 100644
--- a/src/ol/format/IIIFInfo.js
+++ b/src/ol/format/IIIFInfo.js
@@ -2,6 +2,8 @@
  * @module ol/format/IIIFInfo
  */
 
+import {assert} from '../asserts.js';
+
 /**
  * Supported image formats, qualities and supported region / size calculation features
  * for different image API versions and compliance levels
diff --git a/src/ol/source/IIIF.js b/src/ol/source/IIIF.js
index 2d5343436d..63efbdf9a8 100644
--- a/src/ol/source/IIIF.js
+++ b/src/ol/source/IIIF.js
@@ -238,8 +238,8 @@ class IIIF extends TileImage {
       tileClass: IiifTileClass,
       tileGrid: tileGrid,
       tilePixelRatio: options.tilePixelRatio,
-      tileUrlFunction: tileUrlFunction
-      transition: options.transition,
+      tileUrlFunction: tileUrlFunction,
+      transition: options.transition
     });
 
   }