diff --git a/assets/js/ais.js b/assets/js/ais.js
index cac8743..7fb34c3 100644
--- a/assets/js/ais.js
+++ b/assets/js/ais.js
@@ -69,10 +69,12 @@ if (!Array.prototype.filter)
     }
 
     /* Match an image style and set the cookie */
+    var min = 0;
     var style = Drupal.settings.ais[0];
     for (i in Drupal.settings.ais) {
-       if (Number(Drupal.settings.ais[i].size) < size && Number(Drupal.settings.ais[i].size) > Number(style.size)) {
+       if (size > min && size <= Number(Drupal.settings.ais[i].size)) {
          style = Drupal.settings.ais[i];
+         min = style.size;
        }
     }
     if (style) {