diff --git a/src/Symfony/Component/Yaml/Escaper.php b/src/Symfony/Component/Yaml/Escaper.php
index 4d3ce244c2ada..9413d7a2c4804 100644
--- a/src/Symfony/Component/Yaml/Escaper.php
+++ b/src/Symfony/Component/Yaml/Escaper.php
@@ -22,7 +22,7 @@
class Escaper
{
// Characters that would cause a dumped string to require double quoting.
- const REGEX_CHARACTER_TO_ESCAPE = "[\\x00-\\x1f]|\xc2\x85|\xc2\xa0|\xe2\x80\xa8|\xe2\x80\xa9";
+ const REGEX_CHARACTER_TO_ESCAPE = "[\\x00-\\x1f]|\x7f|\xc2\x85|\xc2\xa0|\xe2\x80\xa8|\xe2\x80\xa9";
// Mapping arrays for escaping a double quoted string. The backslash is
// first to ensure proper escaping because str_replace operates iteratively
@@ -33,6 +33,7 @@ class Escaper
"\x08", "\x09", "\x0a", "\x0b", "\x0c", "\x0d", "\x0e", "\x0f",
"\x10", "\x11", "\x12", "\x13", "\x14", "\x15", "\x16", "\x17",
"\x18", "\x19", "\x1a", "\x1b", "\x1c", "\x1d", "\x1e", "\x1f",
+ "\x7f",
"\xc2\x85", "\xc2\xa0", "\xe2\x80\xa8", "\xe2\x80\xa9",
];
private static $escaped = ['\\\\', '\\"', '\\\\', '\\"',
@@ -40,6 +41,7 @@ class Escaper
'\\b', '\\t', '\\n', '\\v', '\\f', '\\r', '\\x0e', '\\x0f',
'\\x10', '\\x11', '\\x12', '\\x13', '\\x14', '\\x15', '\\x16', '\\x17',
'\\x18', '\\x19', '\\x1a', '\\e', '\\x1c', '\\x1d', '\\x1e', '\\x1f',
+ '\\x7f',
'\\N', '\\_', '\\L', '\\P',
];
diff --git a/src/Symfony/Component/Yaml/Tests/DumperTest.php b/src/Symfony/Component/Yaml/Tests/DumperTest.php
index bb2a575eebdab..e4dc49f331d72 100644
--- a/src/Symfony/Component/Yaml/Tests/DumperTest.php
+++ b/src/Symfony/Component/Yaml/Tests/DumperTest.php
@@ -289,6 +289,7 @@ public function getEscapeSequences()
'double-quote' => ['"', "'\"'"],
'slash' => ['/', '/'],
'backslash' => ['\\', '\\'],
+ 'del' => ["\x7f", '"\x7f"'],
'next-line' => ["\xC2\x85", '"\\N"'],
'non-breaking-space' => ["\xc2\xa0", '"\\_"'],
'line-separator' => ["\xE2\x80\xA8", '"\\L"'],
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