diff --git a/app/Transformers/PiggyBankTransformer.php b/app/Transformers/PiggyBankTransformer.php
index 9eda9ff168..a8c0c3d19d 100644
--- a/app/Transformers/PiggyBankTransformer.php
+++ b/app/Transformers/PiggyBankTransformer.php
@@ -132,7 +132,7 @@ class PiggyBankTransformer extends AbstractTransformer
         $return = [];
         foreach ($piggyBank->accounts()->get() as $account) {
             $return[] = [
-                'id'                    => $account->id,
+                'id'                    => (string) $account->id,
                 'name'                  => $account->name,
                 'current_amount'        => (string) $account->pivot->current_amount,
                 'native_current_amount' => (string) $account->pivot->native_current_amount,