diff --git a/index.js b/index.js
index 0aa23ed..dd8103b 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,9 @@
 exports.quote = function (xs) {
     return xs.map(function (s) {
-        if (/["\s]/.test(s) && !/'/.test(s)) {
+        if (s && typeof s === 'object') {
+            return s.op.replace(/(.)/g, '\\$1');
+        }
+        else if (/["\s]/.test(s) && !/'/.test(s)) {
             return "'" + s.replace(/(['\\])/g, '\\$1') + "'";
         }
         else if (/["'\s]/.test(s)) {