diff --git a/domain_variable.domain.inc b/domain_variable.domain.inc
index 2d0a779..1234722 100644
--- a/domain_variable.domain.inc
+++ b/domain_variable.domain.inc
@@ -20,5 +20,5 @@ function domain_variable_domain_batch() {
  */
 function domain_variable_domain_delete($domain, $form_values = array()) {
   $realm_key = _domain_variable_realm_key($domain);
-  variable_store_delete_all('domain', $domain['domain_id']);
+  variable_store_delete_all('domain', $realm_key);
 }