diff --git a/lib/server/pack.js b/lib/server/pack.js
index be91c1dc..581dda78 100644
--- a/lib/server/pack.js
+++ b/lib/server/pack.js
@@ -25,10 +25,14 @@
                 pipe.create(from, to, options, callback);
             else
                 createTar(from, function(readStream) {
-                    var dir     = path.dirname(to),
-                        name    = path.basename(to, '.zip');
+                    var dir, name,
+                        isStr   = Util.isString(to);
                     
-                    to      = dir + path.sep + name + '.tar.gz';
+                    if (isStr) {
+                        dir     = path.dirname(to),
+                        name    = path.basename(to, '.zip');
+                        to      = dir + path.sep + name + '.tar.gz';
+                    }
                     
                     pipe.create(readStream, to, options, callback);
                 });