diff --git a/src/defaults.js b/src/defaults.js
index 444c6b8..be07b6c 100644
--- a/src/defaults.js
+++ b/src/defaults.js
@@ -13,6 +13,8 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
+const E = require('./enums')
+
 const opts =  {
   proxy: {
     hostname: null,