diff --git a/lib/proto/attach-form.js b/lib/proto/attach-form.js
index 0bfec63..39333a2 100644
--- a/lib/proto/attach-form.js
+++ b/lib/proto/attach-form.js
@@ -67,7 +67,7 @@ function parseFormElements(el) {
 
           for (var i = 0; i < element.options.length; i++) {
             opt = element.options[i]
-            if (opt.selected) {
+            if (opt.selected && !opt.disabled) {
               values.push(opt.hasAttribute("value") ? opt.value : opt.text)
             }
           }