diff --git a/src/Symfony/Components/Yaml/Inline.php b/src/Symfony/Components/Yaml/Inline.php
index 854f4bba59..b94f7a15ea 100644
--- a/src/Symfony/Components/Yaml/Inline.php
+++ b/src/Symfony/Components/Yaml/Inline.php
@@ -37,15 +37,30 @@ class Inline
       return '';
     }
 
+    if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2)
+    {
+      $mbEncoding = mb_internal_encoding();
+      mb_internal_encoding('ASCII');
+    }
+
     switch ($value[0])
     {
       case '[':
-        return self::parseSequence($value);
+        $result = self::parseSequence($value);
+        break;
       case '{':
-        return self::parseMapping($value);
+        $result = self::parseMapping($value);
+        break;
       default:
-        return self::parseScalar($value);
+        $result = self::parseScalar($value);
     }
+
+    if (isset($mbEncoding))
+    {
+      mb_internal_encoding($mbEncoding);
+    }
+
+    return $result;
   }
 
   /**
diff --git a/src/Symfony/Components/Yaml/Parser.php b/src/Symfony/Components/Yaml/Parser.php
index 330f9a1ef6..b47a0dd0b8 100644
--- a/src/Symfony/Components/Yaml/Parser.php
+++ b/src/Symfony/Components/Yaml/Parser.php
@@ -50,6 +50,12 @@ class Parser
     $this->currentLine = '';
     $this->lines = explode("\n", $this->cleanup($value));
 
+    if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2)
+    {
+      $mbEncoding = mb_internal_encoding();
+      mb_internal_encoding('ASCII');
+    }
+
     $data = array();
     while ($this->moveToNextLine())
     {
@@ -220,6 +226,11 @@ class Parser
             }
           }
 
+          if (isset($mbEncoding))
+          {
+            mb_internal_encoding($mbEncoding);
+          }
+
           return $value;
         }
 
@@ -253,6 +264,11 @@ class Parser
       }
     }
 
+    if (isset($mbEncoding))
+    {
+      mb_internal_encoding($mbEncoding);
+    }
+
     return empty($data) ? null : $data;
   }