diff --git a/oauth3.core.js b/oauth3.core.js
index 812f14d..912d244 100644
--- a/oauth3.core.js
+++ b/oauth3.core.js
@@ -166,7 +166,7 @@
 
     var redirectUri = opts.redirectUri;
     var scope = opts.scope || directive.authn_scope;
-    var clientId = opts.appId;
+    var clientId = opts.appId || opts.clientId;
     var args = directive[type];
     var uri = args.url;
     var state = Math.random().toString().replace(/^0\./, '');
@@ -272,7 +272,7 @@
     }
 
     var scope = opts.scope || directive.authn_scope;
-    var clientId = opts.appId;
+    var clientId = opts.appId || opts.clientId;
     var clientAgreeTos = opts.clientAgreeTos;
     var clientUri = opts.clientUri;
     var args = directive[type];