diff --git a/lib/cloudcmd.js b/lib/cloudcmd.js
index 4f0479fc..45eaaba5 100644
--- a/lib/cloudcmd.js
+++ b/lib/cloudcmd.js
@@ -55,7 +55,7 @@
             options         = p.config || {},
             keys            = Object.keys(options);
         
-        if (typeof params.prefix !== undefined) {
+        if (typeof params.prefix !== 'undefined') {
             console.log('cloudcmd: prefix property deprecated, use config.prefix instead');
             options.prefix = params.prefix;
         }