diff --git a/opter.js b/opter.js
index 0f5f047..5591aac 100644
--- a/opter.js
+++ b/opter.js
@@ -82,7 +82,7 @@ module.exports = class Opts {
     }
 
     if (name in this.opts) {
-      checkArgs(this.opts[name]);
+      checkArgs(name);
     }
     if (name in this.synonyms) {
       const syn = this.synonyms[name].filter(s => s in this.opts )[0];