diff --git a/virtualmerchant.module b/virtualmerchant.module
index f764c42..c390dc3 100644
--- a/virtualmerchant.module
+++ b/virtualmerchant.module
@@ -123,7 +123,7 @@ function virtualmerchant_charge($order_id, $amount, $data) {
   // Prepare the parameters that we will submit to process the transaction.
   $param = array(
     // Transaction information.
-    'ssl_testmode' => 'FALSE',
+    'ssl_test_mode' => 'FALSE',
     'ssl_transaction_type' => virtualmerchant_txn_type($data['txn_type']),
 
     // API access credentials.
@@ -166,7 +166,7 @@ function virtualmerchant_charge($order_id, $amount, $data) {
 
   // Update the order for test mode if enabled.
   if (variable_get('virtualmerchant_transaction_mode', 'test') != 'production') {
-    $param['ssl_testmode'] = 'TRUE';
+    $param['ssl_test_mode'] = 'TRUE';
 
     // When testing, amount must be less than $50.
     if ($param['ssl_amount'] >= 50) {