diff --git a/lib/df.js b/lib/df.js
index 43d514e..52dbf93 100644
--- a/lib/df.js
+++ b/lib/df.js
@@ -18,16 +18,12 @@
 
     exec(cmd, function (error, stdout, stderr) {
 
-      if (error) { return callback(error); }
-
-      if (stderr) {
-        return callback(new Error(stderr));
-      }
+      if (error) { error.message = stderr; }
 
       var
         response = DFHelper.parse(stdout, options);
 
-        callback(null, response);
+        callback(error || stderr, response);
     });
   }
 
@@ -40,4 +36,4 @@
   require('child_process').exec,
   require('underscore')
   )
-);
\ No newline at end of file
+);