diff --git a/lib/node/config.js b/lib/node/config.js
index dbf8d9d0..4a01ee97 100644
--- a/lib/node/config.js
+++ b/lib/node/config.js
@@ -731,9 +731,11 @@ Config.prototype.parseArg = function parseArg(argv) {
       if (value.length === 0)
         continue;
 
-      alias = Config.alias.arg[key];
-      if (alias)
-        key = alias;
+      if (key.length > 1) {
+        alias = Config.alias.arg[key];
+        if (alias)
+          key = alias;
+      }
 
       this.args[key] = value;