diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index c6e5830bd548..8ad3b1e1b2fd 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -463,8 +463,8 @@ private static function parseMapping($mapping, $flags, &$i = 0, $references = ar
                 break;
             }
 
-            if (!isset($mapping[$i + 1]) || ' ' !== $mapping[$i + 1]) {
-                @trigger_error('Omitting the space after the colon that follows a mapping key definition is deprecated since version 3.2 and will throw a ParseException in 4.0.', E_USER_DEPRECATED);
+            if (!isset($mapping[$i + 1]) || !in_array($mapping[$i + 1], array(' ', '[', ']', '{', '}'), true)) {
+                @trigger_error('Using a colon that is not followed by an indication character (i.e. " ", ",", "[", "]", "{", "}" is deprecated since version 3.2 and will throw a ParseException in 4.0.', E_USER_DEPRECATED);
             }
 
             // value
diff --git a/src/Symfony/Component/Yaml/Tests/InlineTest.php b/src/Symfony/Component/Yaml/Tests/InlineTest.php
index 33bda676f4de..355deb454af0 100644
--- a/src/Symfony/Component/Yaml/Tests/InlineTest.php
+++ b/src/Symfony/Component/Yaml/Tests/InlineTest.php
@@ -166,7 +166,7 @@ public function testParseInvalidMappingKeyShouldThrowException()
 
     /**
      * @group legacy
-     * @expectedDeprecation Omitting the space after the colon that follows a mapping key definition is deprecated since version 3.2 and will throw a ParseException in 4.0.
+     * @expectedDeprecation Using a colon that is not followed by an indication character (i.e. " ", ",", "[", "]", "{", "}" is deprecated since version 3.2 and will throw a ParseException in 4.0.
      * throws \Symfony\Component\Yaml\Exception\ParseException in 4.0
      */
     public function testParseMappingKeyWithColonNotFollowedBySpace()
@@ -395,6 +395,8 @@ public function getTestsForParse()
             array('[foo, {bar: foo}]', array('foo', array('bar' => 'foo'))),
             array('{ foo: {bar: foo} }', array('foo' => array('bar' => 'foo'))),
             array('{ foo: [bar, foo] }', array('foo' => array('bar', 'foo'))),
+            array('{ foo:{bar: foo} }', array('foo' => array('bar' => 'foo'))),
+            array('{ foo:[bar, foo] }', array('foo' => array('bar', 'foo'))),
 
             array('[  foo, [  bar, foo  ]  ]', array('foo', array('bar', 'foo'))),