diff --git a/lib/shell.js b/lib/shell.js
index 670b202..7736a0e 100644
--- a/lib/shell.js
+++ b/lib/shell.js
@@ -24,7 +24,12 @@ exports.makeCmdLine = function(cmd) {
         return cmd;
     } else if (typeof(cmd) === "object") {
         return cmd.map(function(s) {
-            return "\"" + exports.addslashes(s) + "\"";
+            var regex = /[ "]/g;
+            if (!regex.test(s)) {
+                return s;
+            } else {
+                return "\"" + exports.addslashes(s) + "\"";
+            }
         }).join(' ');
     } else {
         return "";