diff --git a/lib/SmartThingsOAuth2Client.js b/lib/SmartThingsOAuth2Client.js
index 9ffa975..56e909f 100644
--- a/lib/SmartThingsOAuth2Client.js
+++ b/lib/SmartThingsOAuth2Client.js
@@ -8,9 +8,9 @@ const SmartThingsOAuth2Token = require( './SmartThingsOAuth2Token' );
 
 class SmartThingsOAuth2Client extends OAuth2Client
 {
-    static CLIENT_ID = Homey.env.SMARTTHINGS_CLIENT_ID || 'not_used';
+    static CLIENT_ID = Homey.env.SMARTTHINGS_CLIENT_ID || null;
 
-    static CLIENT_SECRET = Homey.env.SMARTTHINGS_CLIENT_SECRET || 'not_used';
+    static CLIENT_SECRET = Homey.env.SMARTTHINGS_CLIENT_SECRET || null;
 
     static API_URL = Homey.env.SMARTTHINGS_API_URL || 'https://api.smartthings.com';