diff --git a/Gruntfile.js b/Gruntfile.js
index 08cff05..98c70f5 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -127,6 +127,20 @@ module.exports = function(grunt) {
           ]
         }
       },
+      sourcemap4_options: {
+        options: {
+          sourceMap: true,
+          sourceMapName: 'tmp/sourcemap4_embed_map.map',
+          sourceMapRoot: 'file://tmp'
+        },
+        files: {
+          'tmp/sourcemap4_embed': [
+            'test/fixtures/mappedsource_embed',
+            'test/fixtures/file1',
+            'test/fixtures/file2'
+          ]
+        }
+      },
       sourcemap_js: {
         options: {
           banner: '/*\nJS Banner\n*/\n',
diff --git a/tasks/concat.js b/tasks/concat.js
index 81fd862..b7c9d09 100644
--- a/tasks/concat.js
+++ b/tasks/concat.js
@@ -25,7 +25,8 @@ module.exports = function(grunt) {
       process: false,
       sourceMap: false,
       sourceMapName: undefined,
-      sourceMapStyle: 'embed'
+      sourceMapStyle: 'embed',
+      sourceMapRoot: undefined
     });
 
     // Normalize boolean options that accept options objects.
diff --git a/tasks/lib/sourcemap.js b/tasks/lib/sourcemap.js
index 6c36473..3c7f82c 100644
--- a/tasks/lib/sourcemap.js
+++ b/tasks/lib/sourcemap.js
@@ -32,7 +32,8 @@ exports.init = function(grunt) {
     // ensure we're using forward slashes, because these are URLs
     var file = path.relative(path.dirname(this.dest), this.files.dest).replace(/\\/g, '/');
     var generator = new SourceMapGenerator({
-      file: file
+      file: file,
+      sourceRoot: this.options.sourceMapRoot
     });
     this.file = file;
     this.generator = generator;
diff --git a/test/concat_test.js b/test/concat_test.js
index 3de58d6..cded92a 100644
--- a/test/concat_test.js
+++ b/test/concat_test.js
@@ -83,7 +83,7 @@ exports.concat = {
     test.done();
   },
   sourcemap_options: function(test) {
-    test.expect(5);
+    test.expect(6);
 
     var actual = getNormalizedFile('tmp/sourcemap_inline');
     var expected = getNormalizedFile('test/expected/sourcemap_inline');
@@ -105,6 +105,10 @@ exports.concat = {
     expected = getNormalizedFile('test/expected/sourcemap_css.css.map');
     test.equal(actual, expected, 'should output the css map.');
 
+    actual = getNormalizedFile('tmp/sourcemap4_embed_map.map');
+    expected = getNormalizedFile('test/expected/sourcemap4_embed_map.map');
+    test.equal(actual, expected, 'should include sourceRoot.');
+
     test.done();
   }
 };
diff --git a/test/expected/sourcemap4_embed_map.map b/test/expected/sourcemap4_embed_map.map
new file mode 100644
index 0000000..de93916
--- /dev/null
+++ b/test/expected/sourcemap4_embed_map.map
@@ -0,0 +1 @@
+{"version":3,"sources":["../test/fixtures/file1","../test/fixtures/mappedsource_embed","../test/fixtures/file2"],"names":[],"mappings":"AAAA;ACCA,E;ADDA;AEAA","file":"sourcemap4_embed","sourceRoot":"file://tmp","sourcesContent":["file1","file1","file2"]}
\ No newline at end of file