diff --git a/lib/main.js b/lib/main.js
index b5d5776f..4f81c3ac 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -163,7 +163,7 @@ Lambda.prototype._rsync = function (program, codeDirectory, callback) {
 };
 
 Lambda.prototype._npmInstall = function (program, codeDirectory, callback) {
-  exec('npm install --production --prefix ' + codeDirectory, function (err) {
+  exec('npm -s install --production --prefix ' + codeDirectory, function (err) {
     if (err) {
       return callback(err);
     }