diff --git a/lib/server/win.js b/lib/server/win.js
index 47fb466b..12832718 100644
--- a/lib/server/win.js
+++ b/lib/server/win.js
@@ -24,6 +24,8 @@
     function getVolumes(callback) {
         var wmic = spawn('wmic', ['logicaldisk', 'get', 'name']);
         
+        Util.checkArgs(arguments, ['callback']);
+        
         /* stream should be closed on win xp*/
         wmic.stdin.end();