diff --git a/src/Framework/FieldsAPI/Properties/DonationForm/CurrencySwitcherSetting.php b/src/Framework/FieldsAPI/Properties/DonationForm/CurrencySwitcherSetting.php
index 78fd86763a..c1a3d5875d 100644
--- a/src/Framework/FieldsAPI/Properties/DonationForm/CurrencySwitcherSetting.php
+++ b/src/Framework/FieldsAPI/Properties/DonationForm/CurrencySwitcherSetting.php
@@ -44,6 +44,7 @@ public function __construct(
     /**
      * @since 3.0.0
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return get_object_vars($this);
@@ -120,4 +121,4 @@ public function getGateways(): array
     {
         return $this->gateways;
     }
-}
\ No newline at end of file
+}