diff --git a/src/tiledimage.js b/src/tiledimage.js
index 0c666f1e..6ff3273c 100644
--- a/src/tiledimage.js
+++ b/src/tiledimage.js
@@ -1299,13 +1299,9 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
             ))
         );
 
-        if (!highestLevel) {
-            highestLevel = 0;
-        }
-
         // Calculations for the interval of levels to draw
         // can return invalid intervals; fix that here if necessary
-        highestLevel = Math.max(highestLevel, this.source.minLevel || 0);
+        highestLevel = Math.max(highestLevel || 0, this.source.minLevel || 0);
         lowestLevel = Math.min(lowestLevel, highestLevel);
         return {
             lowestLevel: lowestLevel,