diff --git a/BuildServer/lib/builder.js b/BuildServer/lib/builder.js
index 09c5ddb..3d79151 100644
--- a/BuildServer/lib/builder.js
+++ b/BuildServer/lib/builder.js
@@ -38,7 +38,7 @@ var build = function (options, callback) {
 		branch = options.branch,
 		skipGitLoader = options.skipGitLoader,
 		local = options.app.get('gitpath') + "/r/",
-		tmp = options.app.get('tmpcodepath') + "/" + rev.substr(0, 20),
+		tmp = options.app.get('tmpcodepath') + "/" + rev.substr(0, 15),
 		exported = tmp + codePostfix,
 		release = options.app.get('releasepath') + "/" + owner + "/" + reponame + "/" + branch + "/" + rev,
 		statusQueue = async.queue(function (task, callback) {