diff --git a/commerce_currency.module b/commerce_currency.module
index afb34c5..063f1ef 100644
--- a/commerce_currency.module
+++ b/commerce_currency.module
@@ -14,6 +14,7 @@ function commerce_currency_field_info() {
       'label' => t('Currency'),
       'description' => t('This field stores currencies.'),
       'settings' => array(),
+      'property_type' => 'text',
       'instance_settings' => array(),
       'default_widget' => 'commerce_currency',
       'default_formatter' => 'commerce_currency_formatted',