diff --git a/src/Symfony/Component/Yaml/Escaper.php b/src/Symfony/Component/Yaml/Escaper.php
index be846e50c7eb..2820778feac9 100644
--- a/src/Symfony/Component/Yaml/Escaper.php
+++ b/src/Symfony/Component/Yaml/Escaper.php
@@ -72,7 +72,15 @@ public static function escapeWithDoubleQuotes($value)
      */
     public static function requiresSingleQuoting($value)
     {
-        return self::containsCharRequiresSingleQuoting($value) || self::isValueRequiresSingleQuoting($value);
+        // Determines if the PHP value contains any single characters that would
+        // cause it to require single quoting in YAML.
+        if (preg_match('/[ \s \' " \: \{ \} \[ \] , & \* \# \?] | \A[ \- ? | < > = ! % @ ` ]/x', $value)) {
+            return true;
+        }
+
+        // Determines if a PHP value is entirely composed of a value that would
+        // require single quoting in YAML.
+        return in_array(strtolower($value), array('null', '~', 'true', 'false', 'y', 'n', 'yes', 'no', 'on', 'off'));
     }
 
     /**
@@ -86,30 +94,4 @@ public static function escapeWithSingleQuotes($value)
     {
         return sprintf("'%s'", str_replace('\'', '\'\'', $value));
     }
-
-    /**
-     * Determines if a PHP value contains any single characters that would cause
-     * the value to require single quoting in YAML.
-     *
-     * @param  string $value A PHP value
-     * @return bool          True if the value would require single quotes.
-     */
-    private static function containsCharRequiresSingleQuoting($value)
-    {
-        return preg_match('/[ \s \' " \: \{ \} \[ \] , & \* \# \?] | \A[ \- ? | < > = ! % @ ` ]/x', $value);
-    }
-
-    /**
-     * Determines if a PHP value is entirely composed of a value that would
-     * require single quoting in YAML.
-     *
-     * @param  string $value A PHP value
-     * @return bool          True if the value would require single quotes.
-     */
-    private static function isValueRequiresSingleQuoting($value)
-    {
-        // Note that whilst 'y' and 'n' are not supported as valid Booleans,
-        // they are escaped here for interoperability.
-        return in_array(strtolower($value), array('null', '~', 'true', 'false', 'y', 'n', 'yes', 'no', 'on', 'off'));
-    }
 }