diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7da5e52
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.swp
+*.tgz
+SHA256SUMS
+node_modules/
diff --git a/http-on-off-adapter.js b/http-on-off-adapter.js
index e762101..31f51e2 100644
--- a/http-on-off-adapter.js
+++ b/http-on-off-adapter.js
@@ -8,11 +8,24 @@
 
 'use strict';
 
-const Adapter = require('../adapter');
-const Device = require('../device');
-const Property = require('../property');
 const fetch = require('node-fetch');
 
+let Adapter, Device, Property;
+try {
+  Adapter = require('../adapter');
+  Device = require('../device');
+  Property = require('../property');
+} catch (e) {
+  if (e.code !== 'MODULE_NOT_FOUND') {
+    throw e;
+  }
+
+  const gwa = require('gateway-addon');
+  Adapter = gwa.Adapter;
+  Device = gwa.Device;
+  Property = gwa.Property;
+}
+
 class HttpOnOffProperty extends Property {
   constructor(device, name, propertyDescription) {
     super(device, name, propertyDescription);
diff --git a/package.json b/package.json
index 97ce7cf..4123d1d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "http-on-off-adapter",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "description": "Simple HTTP On/Off Switch",
   "main": "index.js",
   "keywords": [
@@ -29,7 +29,7 @@
   "moziot": {
     "api": {
       "min": 1,
-      "max": 1
+      "max": 2
     },
     "plugin": true,
     "exec": "{nodeLoader} {path}",