diff --git a/lib/gpmclient.js b/lib/gpmclient.js
index cbed14a..6683713 100644
--- a/lib/gpmclient.js
+++ b/lib/gpmclient.js
@@ -109,7 +109,7 @@ function GpmClient(options) {
   var vc;
   if (tty) {
     var tty = tty[0];
-    vc = /[0-9]+$/.exec(tty)[0];
+    vc = +/[0-9]+$/.exec(tty)[0];
   }
 
   var self = this;