diff --git a/lib/asset-resolver.js b/lib/asset-resolver.js
index <HASH>..<HASH> 100644
--- a/lib/asset-resolver.js
+++ b/lib/asset-resolver.js
@@ -12,12 +12,12 @@ function AssetResolver(options) {
   Object.freeze(this);
 }
 
-AssetResolver.prototype.resolvePath = function (to) {
-  return resolvePath(to, this.options);
+AssetResolver.prototype.resolvePath = function (to, callback) {
+  return resolvePath(to, this.options, callback);
 };
 
-AssetResolver.prototype.resolveUrl = function (to) {
-  return resolveUrl(to, this.options);
+AssetResolver.prototype.resolveUrl = function (to, callback) {
+  return resolveUrl(to, this.options, callback);
 };
 
 module.exports = AssetResolver;
Pass callbacks to AssetResolver.prototype methods