diff --git a/app/Models/Currency.php b/app/Models/Currency.php
index 77d99d543a36..8349650dd7b2 100644
--- a/app/Models/Currency.php
+++ b/app/Models/Currency.php
@@ -20,6 +20,7 @@ class Currency extends Eloquent
      */
     protected $casts = [
         'swap_currency_symbol' => 'boolean',
+        'exchange_rate' => 'double',
     ];
 
     /**