diff --git a/src/OpenLayers/Layers/SourceWMTS.js b/src/OpenLayers/Layers/SourceWMTS.js
index ab109f77..7edb2253 100644
--- a/src/OpenLayers/Layers/SourceWMTS.js
+++ b/src/OpenLayers/Layers/SourceWMTS.js
@@ -95,7 +95,7 @@ var SourceWMTS = (function (WMTSExtended) {
                 tileGrid : new WMTSTileGrid({
                     resolutions : wmtsParams.nativeResolutions,
                     matrixIds : wmtsParams.matrixIds,
-                    origin : [wmtsParams.tileMatrices[0].topLeftCorner.x, wmtsParams.tileMatrices[0].topLeftCorner.y]
+                    origin : [Object.values(wmtsParams.tileMatrices)[0].topLeftCorner.x, Object.values(wmtsParams.tileMatrices)[0].topLeftCorner.y]
                 })
             };