diff --git a/app.js b/app.js
index a7445b7..4495970 100644
--- a/app.js
+++ b/app.js
@@ -39,6 +39,7 @@ function buildCmd() {
         "then echo \"Please run as root (or with sudo)\"\n" +
         "  exit\n" +
         "fi\n\n" +
+        "apt-get update\n" +
         "apt-get install -y build-essential libpcre3 libpcre3-dev zlib1g zlib1g-dev libssl-dev wget git\n" +
         "wget " + document.getElementById("link").value + "\n" +
         "tar -xzvf " + extractNginxVersion(nginxStr) + "\n";