diff --git a/src/Composer/Json/JsonFile.php b/src/Composer/Json/JsonFile.php
index 307139a6f..0fc0105b3 100644
--- a/src/Composer/Json/JsonFile.php
+++ b/src/Composer/Json/JsonFile.php
@@ -113,22 +113,23 @@ class JsonFile
      * Original code for this function can be found at:
      *  http://recursive-design.com/blog/2008/03/11/format-json-with-php/
      *
-     * @param array $hash Data to encode into a formatted JSON string
+     * @param mixed $data Data to encode into a formatted JSON string
      * @param int $options json_encode options
      * @return string Encoded json
      */
-    static public function encode(array $hash, $options = 448)
+    static public function encode($data, $options = 448)
     {
         if (version_compare(PHP_VERSION, '5.4', '>=')) {
-            return json_encode($hash, $options);
+            return json_encode($data, $options);
         }
 
-        $json = json_encode($hash);
+        $json = json_encode($data);
 
         $prettyPrint = (Boolean) ($options & JSON_PRETTY_PRINT);
         $unescapeUnicode = (Boolean) ($options & JSON_UNESCAPED_UNICODE);
+        $unescapeSlashes = (Boolean) ($options & JSON_UNESCAPED_SLASHES);
 
-        if (!$prettyPrint && !$unescapeUnicode) {
+        if (!$prettyPrint && !$unescapeUnicode && !$unescapeSlashes) {
             return $json;
         }
 
@@ -155,15 +156,18 @@ class JsonFile
                 $noescape = '\\' === $char ? !$noescape : true;
                 continue;
             } elseif ('' !== $buffer) {
-                if ($unescapeUnicode && function_exists('mb_convert_encoding')) {
-                    // http://stackoverflow.com/questions/2934563/how-to-decode-unicode-escape-sequences-like-u00ed-to-proper-utf-8-encoded-cha
-                    $result .= preg_replace_callback('/\\\\u([0-9a-f]{4})/i', function($match) {
-                        return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');
-                    }, $buffer.$char);
-                } else {
-                    $result .= $buffer.$char;
+                if ($unescapeSlashes) {
+                    $buffer = str_replace('\\/', '/', $buffer);
                 }
 
+                if ($unescapeUnicode && function_exists('mb_convert_encoding')) {
+                    // http://stackoverflow.com/questions/2934563/how-to-decode-unicode-escape-sequences-like-u00ed-to-proper-utf-8-encoded-cha
+                    $buffer = preg_replace_callback('/\\\\u([0-9a-f]{4})/i', function($match) {
+                        return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');
+                    }, $buffer);
+                }
+
+                $result .= $buffer.$char;
                 $buffer = '';
                 continue;
             }
@@ -213,7 +217,7 @@ class JsonFile
      *
      * @param   string  $json   json string
      *
-     * @return  array
+     * @return  mixed
      */
     static public function parseJson($json)
     {
diff --git a/tests/Composer/Test/Json/JsonFileTest.php b/tests/Composer/Test/Json/JsonFileTest.php
index 4ed016fa6..00711bb11 100644
--- a/tests/Composer/Test/Json/JsonFileTest.php
+++ b/tests/Composer/Test/Json/JsonFileTest.php
@@ -107,7 +107,7 @@ class JsonFileTest extends \PHPUnit_Framework_TestCase
     {
         $data = array('name' => 'composer/composer');
         $json = '{
-    "name": "composer\/composer"
+    "name": "composer/composer"
 }';
         $this->assertJsonFormat($json, $data);
     }
@@ -116,7 +116,7 @@ class JsonFileTest extends \PHPUnit_Framework_TestCase
     {
         $data = array('Metadata\\' => 'src/');
         $json = '{
-    "Metadata\\\\": "src\/"
+    "Metadata\\\\": "src/"
 }';
         $this->assertJsonFormat($json, $data);
     }
@@ -125,7 +125,7 @@ class JsonFileTest extends \PHPUnit_Framework_TestCase
     {
         $data = array("Metadata\\\"" => 'src/');
         $json = '{
-    "Metadata\\\\\\"": "src\/"
+    "Metadata\\\\\\"": "src/"
 }';
 
         $this->assertJsonFormat($json, $data);
@@ -141,6 +141,20 @@ class JsonFileTest extends \PHPUnit_Framework_TestCase
         $this->assertJsonFormat($json, $data);
     }
 
+    public function testEscapedSlashes()
+    {
+        $data = "\\/fooƌ";
+
+        $this->assertJsonFormat('"\\\\\\/fooƌ"', $data, JSON_UNESCAPED_UNICODE);
+    }
+
+    public function testEscapedUnicode()
+    {
+        $data = "ƌ";
+
+        $this->assertJsonFormat('"\\u018c"', $data, 0);
+    }
+
     private function expectParseException($text, $json)
     {
         try {
@@ -151,11 +165,15 @@ class JsonFileTest extends \PHPUnit_Framework_TestCase
         }
     }
 
-    private function assertJsonFormat($json, $data)
+    private function assertJsonFormat($json, $data, $options = null)
     {
         $file = new JsonFile('composer.json');
 
-        $this->assertEquals($json, $file->encode($data));
+        if (null === $options) {
+            $this->assertEquals($json, $file->encode($data));
+        } else {
+            $this->assertEquals($json, $file->encode($data, $options));
+        }
     }
 
 }