diff --git a/oauth2_server.install b/oauth2_server.install
index dbaf91d..db7196d 100644
--- a/oauth2_server.install
+++ b/oauth2_server.install
@@ -358,6 +358,7 @@ function oauth2_server_schema() {
 function oauth2_server_uninstall() {
   // Delete attached fields.
   field_attach_delete_bundle('oauth2_server_authorization_code', 'oauth2_server_authorization_code');
+  require_once __DIR__ . '/oauth2_server.module';
   foreach (array_keys(oauth2_server_token_bundles()) as $bundle) {
     field_attach_delete_bundle('oauth2_server_token', $bundle);
   }