diff --git a/leaflet-iiif.js b/leaflet-iiif.js
index 8f589eb..014d5fd 100644
--- a/leaflet-iiif.js
+++ b/leaflet-iiif.js
@@ -139,8 +139,11 @@ L.TileLayer.Iiif = L.TileLayer.extend({
         };
 
         // Calculates maximum native zoom for the layer
-        _this.maxNativeZoom = Math.max(ceilLog2(_this.x / _this.options.tileSize),
-          ceilLog2(_this.y / _this.options.tileSize));
+        _this.maxNativeZoom = Math.max(
+          ceilLog2(_this.x / _this.options.tileSize),
+          ceilLog2(_this.y / _this.options.tileSize),
+          0
+        );
         
         // Enable zooming further than native if maxZoom option supplied
         if (_this._customMaxZoom && _this.options.maxZoom > _this.maxNativeZoom) {