diff --git a/lib/OpenLayers/Format/WMTSCapabilities.js b/lib/OpenLayers/Format/WMTSCapabilities.js
index 8efce532b2..02c7ab321c 100644
--- a/lib/OpenLayers/Format/WMTSCapabilities.js
+++ b/lib/OpenLayers/Format/WMTSCapabilities.js
@@ -193,7 +193,7 @@ OpenLayers.Format.WMTSCapabilities = OpenLayers.Class(OpenLayers.Format.XML.Vers
             url = [];
             var constraint;
             for (var i = 0, ii = httpGet.length; i < ii; i++) {
-                cnstraint = httpGet[i].constraints;
+                constraint = httpGet[i].constraints;
                 if (!constraint || (constraint && constraint.
                         GetEncoding.allowedValues[requestEncoding])) {
                     url.push(httpGet[i].url);