diff --git a/tasks/lib/sourcemap.js b/tasks/lib/sourcemap.js
index 6c36473..d2f568e 100644
--- a/tasks/lib/sourcemap.js
+++ b/tasks/lib/sourcemap.js
@@ -215,7 +215,7 @@ exports.init = function(grunt) {
     var mapfilepath;
     if (this.options.sourceMapStyle === 'inline') {
       var inlineMap = new Buffer(this._write()).toString('base64');
-      mapfilepath = 'data:application/json;base64,' + inlineMap;
+      mapfilepath = 'data:application/json;charset=utf-8;base64,' + inlineMap;
     } else {
       // Compute relative path to source map destination.
       mapfilepath = path.relative(path.dirname(this.files.dest), this.dest);
diff --git a/test/expected/sourcemap_inline b/test/expected/sourcemap_inline
index c244402..c3678ad 100644
--- a/test/expected/sourcemap_inline
+++ b/test/expected/sourcemap_inline
@@ -8,4 +8,4 @@ lines
 file2
 // line in footer
 // footer
-//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIi4uL3Rlc3QvZml4dHVyZXMvZmlsZTAiLCIuLi90ZXN0L2ZpeHR1cmVzL2ZpbGUyIl0sIm5hbWVzIjpbXSwibWFwcGluZ3MiOiI7O0FBQUEsSUFBSTtBQUNKLElBQUk7QUFDSixDQUFDLENBQUMsSUFBSTtBQUNOOztBQ0hBIiwiZmlsZSI6InNvdXJjZW1hcF9pbmxpbmUiLCJzb3VyY2VzQ29udGVudCI6WyJ0aGlzXG5maWxlXG4rIG1hbnlcbmxpbmVzIiwiZmlsZTIiXX0=
\ No newline at end of file
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIi4uL3Rlc3QvZml4dHVyZXMvZmlsZTAiLCIuLi90ZXN0L2ZpeHR1cmVzL2ZpbGUyIl0sIm5hbWVzIjpbXSwibWFwcGluZ3MiOiI7O0FBQUEsSUFBSTtBQUNKLElBQUk7QUFDSixDQUFDLENBQUMsSUFBSTtBQUNOOztBQ0hBIiwiZmlsZSI6InNvdXJjZW1hcF9pbmxpbmUiLCJzb3VyY2VzQ29udGVudCI6WyJ0aGlzXG5maWxlXG4rIG1hbnlcbmxpbmVzIiwiZmlsZTIiXX0=
\ No newline at end of file