diff --git a/CHANGELOG b/CHANGELOG
index 2ef8dd68d..ea23a1f30 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,6 @@
 * 1.39.2 (2019-XX-XX)
 
+ * added support for "Twig\Markup" instances in the "in" test
  * fixed Lexer when using custom options containing the # char
  * fixed "import" when macros are stored in a template string
 
diff --git a/src/Extension/CoreExtension.php b/src/Extension/CoreExtension.php
index 37301dfd4..e47e7cef1 100644
--- a/src/Extension/CoreExtension.php
+++ b/src/Extension/CoreExtension.php
@@ -935,6 +935,10 @@ function twig_sort_filter($array)
  */
 function twig_in_filter($value, $compare)
 {
+    if ($value instanceof Markup) {
+        $value = (string) $value;
+    }
+
     if (\is_array($compare)) {
         return \in_array($value, $compare, \is_object($value) || \is_resource($value));
     } elseif (\is_string($compare) && (\is_string($value) || \is_int($value) || \is_float($value))) {
diff --git a/test/Twig/Tests/Fixtures/tests/in.test b/test/Twig/Tests/Fixtures/tests/in.test
index 5c3071d5d..9241ae866 100644
--- a/test/Twig/Tests/Fixtures/tests/in.test
+++ b/test/Twig/Tests/Fixtures/tests/in.test
@@ -73,8 +73,10 @@ TRUE
 {{ 5.5 in 125.5 ? 'TRUE' : 'FALSE' }}
 {{ 5.5 in '125.5' ? 'TRUE' : 'FALSE' }}
 {{ '5.5' in 125.5 ? 'TRUE' : 'FALSE' }}
+
+{{ safe in ['foo', 'bar'] ? 'TRUE' : 'FALSE' }}
 --DATA--
-return ['bar' => 'bar', 'foo' => ['bar' => 'bar'], 'dir_object' => new \SplFileInfo(dirname(__FILE__)), 'object' => new \stdClass(), 'resource' => opendir(dirname(__FILE__))]
+return ['bar' => 'bar', 'foo' => ['bar' => 'bar'], 'dir_object' => new \SplFileInfo(dirname(__FILE__)), 'object' => new \stdClass(), 'resource' => opendir(dirname(__FILE__)), 'safe' => new \Twig\Markup('foo', 'UTF-8')]
 --EXPECT--
 TRUE
 TRUE
@@ -126,3 +128,5 @@ TRUE
 FALSE
 TRUE
 FALSE
+
+TRUE