diff --git a/lib/packageModules.js b/lib/packageModules.js
index 650a3cf24..7fffcdf97 100644
--- a/lib/packageModules.js
+++ b/lib/packageModules.js
@@ -9,6 +9,9 @@ const semver = require('semver');
 const fs = require('fs');
 const { getAllNodeFunctions, isProviderGoogle } = require('./utils');
 
+const readFileAsync = BbPromise.promisify(fs.readFile);
+const statAsync = BbPromise.promisify(fs.stat);
+
 function setArtifactPath(funcName, func, artifactPath) {
   const version = this.serverless.getVersion();
 
@@ -90,8 +93,8 @@ function getFileContentAndStat(directory, filePath) {
 
   return BbPromise.all([
     // Get file contents and stat in parallel
-    fs.readFileAsync(fullPath),
-    fs.statAsync(fullPath)
+    readFileAsync(fullPath),
+    statAsync(fullPath)
   ]).then(
     result => ({
       data: result[0],