diff --git a/lib/processCss.js b/lib/processCss.js
index 084918d4..3e24e31a 100644
--- a/lib/processCss.js
+++ b/lib/processCss.js
@@ -179,7 +179,7 @@ module.exports = function processCss(inputSource, inputMap, options, callback) {
 
 	if(minimize) {
 		var minimizeOptions = assign({}, query);
-		["zindex", "normalizeUrl", "discardUnused", "mergeIdents", "reduceIdents"].forEach(function(name) {
+		["zindex", "normalizeUrl", "discardUnused", "mergeIdents", "reduceIdents", "autoprefixer"].forEach(function(name) {
 			if(typeof minimizeOptions[name] === "undefined")
 				minimizeOptions[name] = false;
 		});