diff --git a/src/Provider/OneySimulation/CachedSimulationDataProvider.php b/src/Provider/OneySimulation/CachedSimulationDataProvider.php
index a5a63fcc..5faeac0d 100644
--- a/src/Provider/OneySimulation/CachedSimulationDataProvider.php
+++ b/src/Provider/OneySimulation/CachedSimulationDataProvider.php
@@ -29,7 +29,7 @@ public function __construct(
 
     public function getForCart(OrderInterface $cart): array
     {
-        $country = \explode('_', $cart->getLocaleCode() ?? 'fr_FR')[1];
+        $country = strtoupper(substr($cart->getLocaleCode() ?? 'fr_FR', -2));
         $cacheKey = \sprintf(
             'oney_simulation_%s_%s_%s',
             $country,
diff --git a/src/Provider/OneySimulation/OneySimulationDataProvider.php b/src/Provider/OneySimulation/OneySimulationDataProvider.php
index 0b0f1b9a..932c64bb 100644
--- a/src/Provider/OneySimulation/OneySimulationDataProvider.php
+++ b/src/Provider/OneySimulation/OneySimulationDataProvider.php
@@ -29,7 +29,7 @@ public function __construct(
 
     public function getForCart(OrderInterface $cart): array
     {
-        $country = \explode('_', $cart->getLocaleCode() ?? 'fr_FR')[1];
+        $country = strtoupper(substr($cart->getLocaleCode() ?? 'fr_FR', -2));
 
         $data = [
             'amount' => $cart->getTotal(),