diff --git a/src/ol/source/IIIF.js b/src/ol/source/IIIF.js
index e862c5d917..4748ccd0d3 100644
--- a/src/ol/source/IIIF.js
+++ b/src/ol/source/IIIF.js
@@ -211,7 +211,7 @@ class IIIF extends TileImage {
       } else {
         regionParam = 'full';
         if (supportsListedSizes) {
-          sizeParam = sizes[zoom][0] + ',' + (version == Versions.VERSION3 ? sizes[zoom][0] : '');
+          sizeParam = sizes[zoom][0] + ',' + (version == Versions.VERSION3 ? sizes[zoom][1] : '');
         } else {
           sizeParam = version == Versions.VERSION3 ? 'max' : 'full';
         }