diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index 4c7d37428e474..7784576fa2a17 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -762,12 +762,12 @@ private static function evaluateScalar($scalar, $flags, $references = [])
                         $raw = $scalar;
                         $cast = (int) $scalar;
 
-                        return '0' == $scalar[0] ? octdec($scalar) : (((string) $raw == (string) $cast) ? $cast : $raw);
+                        return '0' === $scalar[0] ? octdec($scalar) : (((string) $raw == (string) $cast) ? $cast : $raw);
                     case '-' === $scalar[0] && ctype_digit(substr($scalar, 1)):
                         $raw = $scalar;
                         $cast = (int) $scalar;
 
-                        return '0' == $scalar[1] ? -octdec(substr($scalar, 1)) : (($raw === (string) $cast) ? $cast : $raw);
+                        return '0' === $scalar[1] ? -octdec(substr($scalar, 1)) : (($raw === (string) $cast) ? $cast : $raw);
                     case is_numeric($scalar):
                     case Parser::preg_match(self::getHexRegex(), $scalar):
                         $scalar = str_replace('_', '', $scalar);
diff --git a/src/Symfony/Component/Yaml/Tests/InlineTest.php b/src/Symfony/Component/Yaml/Tests/InlineTest.php
index b28d472b334b6..bedcfaf66bbb7 100644
--- a/src/Symfony/Component/Yaml/Tests/InlineTest.php
+++ b/src/Symfony/Component/Yaml/Tests/InlineTest.php
@@ -842,4 +842,14 @@ public function phpConstTagWithEmptyValueProvider()
             [['' => 'foo', 'bar' => 'ccc'], '{!php/const  : foo, bar: ccc}'],
         ];
     }
+
+    public function testParseInvalidPositiveOctalNumber()
+    {
+        self::assertSame(342391, Inline::parse('0123456789'));
+    }
+
+    public function testParseInvalidNegativeOctalNumber()
+    {
+        self::assertSame(-342391, Inline::parse('-0123456789'));
+    }
 }