diff --git a/adminrole.install b/adminrole.install
index 8f964f8..cf355da 100644
--- a/adminrole.install
+++ b/adminrole.install
@@ -13,7 +13,7 @@ function adminrole_install() {
   // Check if there is an existing 'admin' named role. If so, do not add a new
   // administrator role.
   $rid = db_query("SELECT 1 FROM {role} WHERE name LIKE 'admin%%'");
-  if (!$rid) {
+  if (!$rid->rowCount()) {
     $rid = db_insert('role')
       ->fields(array(
         'name' => 'administrator',