diff --git a/src/Assert.php b/src/Assert.php
index ee15dff3..5997c2e9 100644
--- a/src/Assert.php
+++ b/src/Assert.php
@@ -17,6 +17,8 @@
 use Countable;
 use Exception;
 use InvalidArgumentException;
+use ResourceBundle;
+use SimpleXMLElement;
 use Throwable;
 use Traversable;
 
@@ -487,7 +489,12 @@ public static function isArrayAccessible($value, $message = '')
      */
     public static function isCountable($value, $message = '')
     {
-        if (!\is_array($value) && !($value instanceof Countable)) {
+        if (
+            !\is_array($value)
+            && !($value instanceof Countable)
+            && !($value instanceof ResourceBundle)
+            && !($value instanceof SimpleXMLElement)
+        ) {
             static::reportInvalidArgument(\sprintf(
                 $message ?: 'Expected a countable. Got: %s',
                 static::typeToString($value)
diff --git a/tests/AssertTest.php b/tests/AssertTest.php
index 890475d5..dea9893f 100644
--- a/tests/AssertTest.php
+++ b/tests/AssertTest.php
@@ -122,6 +122,7 @@ public function getTests()
             array('isCountable', array(array(1, 2)), true),
             array('isCountable', array(new ArrayIterator(array())), true),
             array('isCountable', array(new stdClass()), false),
+            array('isCountable', array(new \SimpleXMLElement('<foo>bar</foo>')), true),
             array('isCountable', array('abcd'), false),
             array('isCountable', array(123), false),
             array('isIterable', array(array()), true),