diff --git a/src/plugins/load.js b/src/plugins/load.js
index 2d2a377070..2b597d7a2b 100644
--- a/src/plugins/load.js
+++ b/src/plugins/load.js
@@ -39,6 +39,11 @@ module.exports = function (Plugins) {
 	};
 
 	Plugins.prepareForBuild = function (callback) {
+		Plugins.cssFiles.length = 0;
+		Plugins.lessFiles.length = 0;
+		Plugins.clientScripts.length = 0;
+		Plugins.acpScripts.length = 0;
+		
 		async.waterfall([
 			async.apply(Plugins.getPluginPaths),
 			function (paths, next) {