diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index 29645fadf70be..f0ab6a37f5c34 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -550,10 +550,6 @@ private static function evaluateScalar($scalar, $flags, $references = array())
                 return false;
             case $scalar[0] === '!':
                 switch (true) {
-                    case 0 === strpos($scalar, '!str'):
-                        @trigger_error('Support for the !str tag is deprecated since version 3.4. Use the !!str tag instead.', E_USER_DEPRECATED);
-
-                        return (string) substr($scalar, 5);
                     case 0 === strpos($scalar, '!!str '):
                         return (string) substr($scalar, 6);
                     case 0 === strpos($scalar, '! '):
diff --git a/src/Symfony/Component/Yaml/Tests/InlineTest.php b/src/Symfony/Component/Yaml/Tests/InlineTest.php
index dd4bfd2ae5f10..23e96b38da508 100644
--- a/src/Symfony/Component/Yaml/Tests/InlineTest.php
+++ b/src/Symfony/Component/Yaml/Tests/InlineTest.php
@@ -703,13 +703,4 @@ public function getNotPhpCompatibleMappingKeyData()
             'float' => array('{0.25: "foo"}', array('0.25' => 'foo')),
         );
     }
-
-    /**
-     * @group legacy
-     * @expectedDeprecation Support for the !str tag is deprecated since version 3.4. Use the !!str tag instead.
-     */
-    public function testDeprecatedStrTag()
-    {
-        $this->assertSame(array('foo' => 'bar'), Inline::parse('{ foo: !str bar }'));
-    }
 }