diff --git a/src/ol/source/IIIF.js b/src/ol/source/IIIF.js
index e2f6eee31c..ff8c450d78 100644
--- a/src/ol/source/IIIF.js
+++ b/src/ol/source/IIIF.js
@@ -260,8 +260,8 @@ class IIIF extends TileImage {
       }
       return baseUrl + regionParam + '/' + sizeParam + '/0/' + quality + '.' + format;
     };
-    
-		const IiifTileClass = CustomTile.bind(null, tilePixelRatio, tileGrid);
+      
+    const IiifTileClass = CustomTile.bind(null, tilePixelRatio, tileGrid);
 
     super({
       attributions: options.attributions,