diff -u b/src/Plugin/migrate/destination/ubercart/d6/EntityOrder.php b/src/Plugin/migrate/destination/ubercart/d6/EntityOrder.php
--- b/src/Plugin/migrate/destination/ubercart/d6/EntityOrder.php
+++ b/src/Plugin/migrate/destination/ubercart/d6/EntityOrder.php
@@ -24,8 +24,7 @@
     if ($values) {
       $adjustments = [];
       foreach ($values as $adjustment) {
-        $amount = $adjustment['amount']['number'];
-        $adjustment['amount'] = new Price($amount, $adjustment['amount']['currency_code']);
+        $adjustment['amount'] = new Price($adjustment['amount']['number'], $adjustment['amount']['currency_code']);
         $adjustments[] = new Adjustment($adjustment);
       }
       $row->setDestinationProperty('adjustments', $adjustments);
diff -u b/src/Plugin/migrate/process/ubercart/d6/UbercartLineItem.php b/src/Plugin/migrate/process/ubercart/d6/UbercartLineItem.php
--- b/src/Plugin/migrate/process/ubercart/d6/UbercartLineItem.php
+++ b/src/Plugin/migrate/process/ubercart/d6/UbercartLineItem.php
@@ -31,7 +31,7 @@
         $adjust['amount'] =
           [
             'number' => $adjustment['amount'],
-            'currency_code' => $adjustment['currency'],
+            'currency_code' => $adjustment['currency_code'],
           ];
         // @TODO: Adjustment sourceId and included.
         $adjustments[] = $adjust;
diff -u b/src/Plugin/migrate/source/ubercart/d6/Order.php b/src/Plugin/migrate/source/ubercart/d6/Order.php
--- b/src/Plugin/migrate/source/ubercart/d6/Order.php
+++ b/src/Plugin/migrate/source/ubercart/d6/Order.php
@@ -2,8 +2,9 @@
 
 namespace Drupal\commerce_migrate\Plugin\migrate\source\ubercart\d6;
 
+use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
-use Drupal\migrate\Plugin\migrate\source\SqlBase;
+use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
 use Drupal\migrate\Row;
 use Drupal\Core\State\StateInterface;
 use Drupal\migrate\Plugin\MigrationInterface;
@@ -16,7 +17,7 @@
  *   id = "d6_ubercart_order"
  * )
  */
-class Order extends SqlBase {
+class Order extends DrupalSqlBase {
 
   /**
    * The module handler.
@@ -28,8 +29,8 @@
   /**
    * {@inheritdoc}
    */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, StateInterface $state, ModuleHandlerInterface $module_handler) {
-    parent::__construct($configuration, $plugin_id, $plugin_definition, $migration, $state);
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, StateInterface $state, EntityManagerInterface $entity_manager, ModuleHandlerInterface $module_handler) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $migration, $state, $entity_manager);
     $this->state = $state;
     $this->moduleHandler = $module_handler;
   }
@@ -44,6 +45,7 @@
       $plugin_definition,
       $migration,
       $container->get('state'),
+      $container->get('entity.manager'),
       $container->get('module_handler')
     );
   }
@@ -86,7 +88,6 @@
 
     $row->setSourceProperty('commerce_shipping', $this->moduleHandler->moduleExists('commerce_shipping'));
     $row->setSourceProperty('adjustments', $this->getAdjustmentData($row));
-    $row->setSourceProperty('currency', $this->getUbercartCurrency());
     return parent::prepareRow($row);
   }
 
@@ -107,7 +108,14 @@
       ->orderBy('weight', 'ASC')
       ->condition('uol.order_id', $order_id);
     $query->innerJoin('uc_orders', 'uo', 'uol.order_id = uo.order_id');
-    return $query->execute()->fetchAll();
+    $adjustments = $query->execute()->fetchAll();
+
+    $currency_code = $this->variableGet('uc_currency_code', 'USD');
+    foreach ($adjustments as &$adjustment) {
+      $adjustment['currency_code'] = $currency_code;
+    }
+    return $adjustments;
+
   }
 
   /**
@@ -124,17 +132,2 @@
 
-  /**
-   * Gets the Ubercart global currency.
-   *
-   * @return string
-   *   The currency.
-   */
-  public function getUbercartCurrency() {
-    static $currency;
-
-    if (empty($currency)) {
-      $currency = $this->variableGet('uc_currency_code', 'USD');
-    }
-    return $currency;
-  }
-
 }