diff --git a/lib/less/index.js b/lib/less/index.js
index 657d9bd0..a74f4242 100644
--- a/lib/less/index.js
+++ b/lib/less/index.js
@@ -87,7 +87,7 @@ var less = {
     require('./tree/' + n);
 });
 
-less.Parser.importer = function (file, paths, callback) {
+less.Parser.importer = function (file, paths, callback, env) {
     var pathname;
 
     // TODO: Undo this at some point,
@@ -116,7 +116,11 @@ less.Parser.importer = function (file, paths, callback) {
           });
         });
     } else {
-        callback({ type: 'File', message: "'" + file + "' wasn't found.\n" });
+        if (typeof(env.errback) === "function") {
+            env.errback(file, paths, callback);
+        } else {
+            callback({ type: 'File', message: "'" + file + "' wasn't found.\n" });
+        }
     }
 }
 
diff --git a/lib/less/parser.js b/lib/less/parser.js
index 1d328d15..d7c5d420 100644
--- a/lib/less/parser.js
+++ b/lib/less/parser.js
@@ -1269,7 +1269,13 @@ if (less.mode === 'browser' || less.mode === 'rhino') {
         // We pass `true` as 3rd argument, to force the reload of the import.
         // This is so we can get the syntax tree as opposed to just the CSS output,
         // as we need this to evaluate the current stylesheet.
-        loadStyleSheet({ href: path, title: path, type: env.mime }, callback, true);
+        loadStyleSheet({ href: path, title: path, type: env.mime }, function (e) {
+            if (e && typeof(env.errback) === "function") {
+                env.errback.call(null, path, paths, callback, env);
+            } else {
+                callback.apply(null, arguments);
+            }
+        }, true);
     };
 }