diff --git a/lib/server/packer.js b/lib/server/packer.js
index 9579c7d5..379562d9 100644
--- a/lib/server/packer.js
+++ b/lib/server/packer.js
@@ -61,19 +61,16 @@
     
     exports.unpack  = function(from, to, callback) {
         var write,
-            isStr   = Util.type.string(from),
-            check   = Util.checkExt,
-            isTarGz = isStr &&  check(from, 'tar.gz'),
+            isTarGz = /\.tar\.gz$/.test(from),
             
             options = {
                 gunzip    : true
             };
         
-        if (tar && isTarGz) {
+        if (isTarGz)
             write   = tar.Extract({ path: to });
-        } else {
+        else
             write   = to;
-        }
         
         files.pipe(from, write, options, callback);
     };