diff --git a/src/Collections/TraversableUtilities.php b/src/Collections/TraversableUtilities.php
index 5877919..48e212e 100644
--- a/src/Collections/TraversableUtilities.php
+++ b/src/Collections/TraversableUtilities.php
@@ -1,33 +1,38 @@
 <?php
 declare(strict_types=1);
 
 namespace Keruald\OmniTools\Collections;
 
 use Countable;
 use ResourceBundle;
 use SimpleXMLElement;
 use TypeError;
 
 class TraversableUtilities {
 
     public static function count ($countable) : int {
         if (self::isCountable($countable)) {
             return count($countable);
         }
 
         if ($countable === null || $countable === false) {
             return 0;
         }
 
         throw new TypeError;
     }
 
     public static function isCountable ($countable) : bool {
+        if (function_exists('is_countable')) {
+            // PHP 7.3 has is_countable
+            return is_countable($countable);
+        }
+
         // https://github.com/Ayesh/is_countable-polyfill/blob/master/src/is_countable.php
         return is_array($countable)
                || $countable instanceof Countable
                || $countable instanceof SimpleXMLElement
                || $countable instanceof ResourceBundle;
     }
 
 }