diff --git a/README.md b/README.md
index f9d62dd..d000de0 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,8 @@ module.exports = {
 }
 ```
 
+Since version 0.4.1: switched to maintained fork of `ng-annotate`: [ng-annotate-patched](https://github.com/bluetech/ng-annotate-patched) to benefit from its improvements.
+
 Since version 0.4.0: for performance reasons, chunks where the name starts with `vendors~` are not
 annotated. To customize this behavior, set the option `annotateChunk` to a method that returns
 `true` if a chunk should be annotated:
diff --git a/index.js b/index.js
index 1005256..1eab7d5 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,7 @@
 
-var ngAnnotate = require('ng-annotate'),
-    SourceMapSource = require('webpack-core/lib/SourceMapSource');
+var ngAnnotate = require('ng-annotate-patched'),
+    SourceMapSource = require('webpack-core/lib/SourceMapSource'),
+    OriginalSource = require('webpack-core/lib/OriginalSource');
 
 function ngAnnotatePlugin(options) {
     this.options = options || { add: true, sourceMap: false };
@@ -47,9 +48,12 @@ ngAnnotatePlugin.prototype.apply = function apply(compiler) {
                     if (options.sourceMap && asset.sourceAndMap) {
                         compilation.assets[file] = new SourceMapSource(value.src, file, JSON.parse(value.map), input, map);
                     }
-                    else {
+                    else if (map) {
                         compilation.assets[file] = new SourceMapSource(value.src, file, map);
                     }
+                    else {
+                        compilation.assets[file] = new OriginalSource(value.src, file);
+                    }
                 }
             }
 
diff --git a/package.json b/package.json
index 1a0010d..febca82 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "ng-annotate-webpack-plugin",
-  "version": "0.4.0",
-  "description": "webpack plugin that runs ng-annotate on your bundles",
+  "version": "0.5.0",
+  "description": "webpack plugin that runs ng-annotate-patched on your bundles",
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
@@ -22,7 +22,7 @@
   },
   "homepage": "https://github.com/cliechty/ng-annotate-webpack-plugin",
   "dependencies": {
-    "ng-annotate": "^1.2.1",
-    "webpack-core": "^0.6.5"
+    "ng-annotate-patched": "^1.13.0",
+    "webpack-core": "^0.6.9"
   }
 }