diff --git a/package.json b/package.json
index 9505ab8820..2a3fd51e93 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,8 @@
     "redis": "^2.8.0",
     "showdown": "^1.8.6",
     "socket.io": "^2.0.4",
-    "superagent": "^3.8.2"
+    "superagent": "^3.8.2",
+    "touch": "^3.1.0"
   },
   "devDependencies": {
     "babel-runtime": "^6.26.0",
diff --git a/rollup.config.js b/rollup.config.js
index f163581f30..bde2579590 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,5 +1,6 @@
 const path = require('path');
 const fs = require('fs');
+const touch = require('touch');
 
 const {
 	get_build_json_path,
@@ -7,7 +8,8 @@ const {
 	apps_list,
 	assets_path,
 	get_public_path,
-	bench_path
+	bench_path,
+	sites_path
 } = require('./rollup.utils');
 
 const less = require('rollup-plugin-less');
@@ -170,6 +172,7 @@ function build_libs() {
 	const target_path = path.resolve(assets_path, libs_path);
 	fs.writeFileSync(target_path, libs_content);
 	console.log('✨  Built libs.min.js'); // eslint-disable-line
+	touch(path.join(sites_path, '.build'), { force: true });
 }
 
 function get_all_apps_config() {
diff --git a/yarn.lock b/yarn.lock
index 0c9a5ed265..6a606f33f4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,6 +2,10 @@
 # yarn lockfile v1
 
 
+abbrev@1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8"
+
 accepts@~1.3.4:
   version "1.3.4"
   resolved "https://registry.yarnpkg.com/accepts/-/accepts-1.3.4.tgz#86246758c7dd6d21a6474ff084a4740ec05eb21f"
@@ -1105,6 +1109,12 @@ negotiator@0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.1.tgz#2b327184e8992101177b28563fb5e7102acd0ca9"
 
+nopt@~1.0.10:
+  version "1.0.10"
+  resolved "https://registry.yarnpkg.com/nopt/-/nopt-1.0.10.tgz#6ddd21bd2a31417b92727dd585f8a6f37608ebee"
+  dependencies:
+    abbrev "1"
+
 normalize-path@^2.0.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-2.1.1.tgz#1ab28b556e198363a8c1a6f7e6fa20137fe6aed9"
@@ -1692,6 +1702,12 @@ to-object-path@^0.3.0:
   dependencies:
     kind-of "^3.0.2"
 
+touch@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/touch/-/touch-3.1.0.tgz#fe365f5f75ec9ed4e56825e0bb76d24ab74af83b"
+  dependencies:
+    nopt "~1.0.10"
+
 tough-cookie@~2.3.0:
   version "2.3.3"
   resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.3.3.tgz#0b618a5565b6dea90bf3425d04d55edc475a7561"