diff --git a/src/LaraCart.php b/src/LaraCart.php
index 41580a6..4254941 100644
--- a/src/LaraCart.php
+++ b/src/LaraCart.php
@@ -63,7 +63,7 @@ public function get($instance = 'default')
      *
      * @return string
      */
-    public function formatMoney($number, $locale = null, $internationalFormat = null)
+    public function formatMoney(float $number, $locale = null, $internationalFormat = null)
     {
         if (empty($locale) === true) {
             $locale = config('laracart.locale', 'en_US');
@@ -113,4 +113,4 @@ public function __call($method, $args)
             $method
         ], $args);
     }
-}
\ No newline at end of file
+}