diff --git a/leaflet-iiif.js b/leaflet-iiif.js
index e1cebf2..ca7dca8 100644
--- a/leaflet-iiif.js
+++ b/leaflet-iiif.js
@@ -52,12 +52,19 @@ L.TileLayer.Iiif = L.TileLayer.extend({
     var xDiff = (maxx - minx);
     var yDiff = (maxy - miny);
 
+    // Canonical URI Syntax for v2
+    var size = Math.ceil(xDiff / scale) + ',';
+    if (_this.type === 'ImageService3') {
+      // Cannonical URI Syntax for v3
+      size = size + Math.ceil(yDiff / scale);
+    }
+
     return L.Util.template(this._baseUrl, L.extend({
       format: _this.options.tileFormat,
       quality: _this.quality,
       region: [minx, miny, xDiff, yDiff].join(','),
       rotation: 0,
-      size: Math.ceil(xDiff / scale) + ','
+      size: size
     }, this.options));
   },
   onAdd: function(map) {
@@ -181,6 +188,7 @@ L.TileLayer.Iiif = L.TileLayer.extend({
         }else {
           _this.profile = data.profile;
         }
+        _this.type = data.type;
 
         _this._setQuality();
 
diff --git a/spec/LTileLayerIiifSpec.js b/spec/LTileLayerIiifSpec.js
index bf08659..fa3e46a 100644
--- a/spec/LTileLayerIiifSpec.js
+++ b/spec/LTileLayerIiifSpec.js
@@ -88,7 +88,21 @@ describe('L.TileLayer.Iiif', function() {
         });
         done();
       })
-    })
+    });
+
+    it('generates a v3 canonical url', function(done) {
+      var v3Image = L.tileLayer.iiif('http://localhost:9876/base/fixtures/v3/info.json');
+      map.addLayer(v3Image);
+      v3Image.on('load', function() {
+        var i = 0;
+        eachImg(v3Image, function (img) {
+          expect(img.src).toBe('http://localhost:9876/base/fixtures/v3/0,0,2000,1271/500,318/0/default.jpg')
+          i++;
+        });
+        done();
+      })
+    });
+    
   });
 
   describe('fitBounds', function() {
diff --git a/spec/fixtures/v3/info.json b/spec/fixtures/v3/info.json
new file mode 100644
index 0000000..372c5c3
--- /dev/null
+++ b/spec/fixtures/v3/info.json
@@ -0,0 +1,28 @@
+{
+  "@context": "http://iiif.io/api/image/3/context.json",
+  "extraFormats": [
+    "jpg",
+    "png"
+  ],
+  "extraQualities": [
+    "default",
+    "color",
+    "gray"
+  ],
+  "height": 1271,
+  "id": "http://iiif.io/api/image/3.0/example/reference/421e65be2ce95439b3ad6ef1f2ab87a9-dee-xray",
+  "profile": "level1",
+  "protocol": "http://iiif.io/api/image",
+  "tiles": [
+    {
+      "height": 512,
+      "scaleFactors": [
+        1,
+        2
+      ],
+      "width": 512
+    }
+  ],
+  "type": "ImageService3",
+  "width": 2000
+}