diff --git a/src/Iterate.php b/src/Iterate.php
index f6f1fd8..6128b54 100644
--- a/src/Iterate.php
+++ b/src/Iterate.php
@@ -87,7 +87,7 @@ class Iterate
         return null;
     }
 
-    public static function splitKeys(array &$array, string $delimiter = ".", string $enclosed = '{}') {
+    public static function splitKeys(array &$array, string $delimiter = ".", string $enclosed = '{}') : array {
         if ( is_array($array) ) {
             $swap = [];