diff --git a/oauth3.core.js b/oauth3.core.js
index 3b31951..d918caf 100644
--- a/oauth3.core.js
+++ b/oauth3.core.js
@@ -1037,7 +1037,7 @@
     }
   , api: function (providerUri, opts) {
       if (!OAUTH3.api[opts.api]) {
-        return OAUTH3.PromiseA.reject(new Error("No API for '" + providerUri + "'"));
+        return OAUTH3.PromiseA.reject(new Error("No API for '" + opts.api + "'"));
       }
 
       return OAUTH3.api[opts.api](providerUri, opts);