diff --git a/Source/Scene/CesiumTerrainProvider.js b/Source/Scene/CesiumTerrainProvider.js
index dc61ff92351d..44ead31016a8 100644
--- a/Source/Scene/CesiumTerrainProvider.js
+++ b/Source/Scene/CesiumTerrainProvider.js
@@ -120,9 +120,11 @@ define([
                 return;
             }
 
+            var baseUri = new Uri(metadataUrl);
+
             that._tileUrlTemplates = data.tiles;
             for (var i = 0; i < that._tileUrlTemplates.length; ++i) {
-                that._tileUrlTemplates[i] = Uri.resolve(that._tileUrlTemplates[i], metadataUrl).replace('{version}', data.version);
+                that._tileUrlTemplates[i] = new Uri(that._tileUrlTemplates[i]).resolve(baseUri).toString().replace('{version}', data.version);
             }
 
             that._availableTiles = data.available;
diff --git a/Source/ThirdParty/Uri.js b/Source/ThirdParty/Uri.js
index 167f88ca954c..08bcb5d2d8d1 100644
--- a/Source/ThirdParty/Uri.js
+++ b/Source/ThirdParty/Uri.js
@@ -242,19 +242,20 @@ define(function() {
 		this.path = output.join('/');
 	};
 
-	/**
-	 * Resolves a relative URI against an absolute base URI.
-	 * Convenience method.
-	 * @param {String} uri the relative URI to resolve
-	 * @param {String} baseURI the base URI (must be absolute) to resolve against
-	 */
-	URI.resolve = function(sURI, sBaseURI) {
-		var uri = cache[sURI] || (cache[sURI] = new URI(sURI));
-		var baseURI = cache[sBaseURI] || (cache[sBaseURI] = new URI(sBaseURI));
-		return uri.resolve(baseURI).toString();
-	};
+	// We don't like this function because it builds up a cache that is never cleared.
+//	/**
+//	 * Resolves a relative URI against an absolute base URI.
+//	 * Convenience method.
+//	 * @param {String} uri the relative URI to resolve
+//	 * @param {String} baseURI the base URI (must be absolute) to resolve against
+//	 */
+//	URI.resolve = function(sURI, sBaseURI) {
+//		var uri = cache[sURI] || (cache[sURI] = new URI(sURI));
+//		var baseURI = cache[sBaseURI] || (cache[sBaseURI] = new URI(sBaseURI));
+//		return uri.resolve(baseURI).toString();
+//	};
 
-	var cache = {};
+//	var cache = {};
 
 	/**
 	 * Serialises the URI to a string.