diff --git a/src/FedexRest/Entity/Address.php b/src/FedexRest/Entity/Address.php
index 06c05a4..25b4ac1 100644
--- a/src/FedexRest/Entity/Address.php
+++ b/src/FedexRest/Entity/Address.php
@@ -81,7 +81,8 @@ public function prepare(): array
             $address['city'] = $this->city;
         }
         if (!empty($this->state_or_province)) {
-            $address['stateOrProvinceCode'] = $this->state_or_province;
+            // Truncate the state/province code to work around a limitation in FedEx's API.
+            $address['stateOrProvinceCode'] = substr($this->state_or_province, 0, 2);
         }
         if (!empty($this->postal_code)) {
             $address['postalCode'] = $this->postal_code;