diff --git a/lib/config-generator.js b/lib/config-generator.js
index 0c1927be..fed64aee 100644
--- a/lib/config-generator.js
+++ b/lib/config-generator.js
@@ -48,6 +48,7 @@ const path = require('path');
 const stringEscaper = require('./utils/string-escaper');
 const crypto = require('crypto');
 const logger = require('./logger');
+const os = require('os');
 
 class ConfigGenerator {
     /**
@@ -131,14 +132,19 @@ class ConfigGenerator {
              *
              * See shared-entry-concat-plugin.js for more details.
              */
-            const tmpFileObject = tmp.fileSync();
+            const staticHashKey = crypto
+                .createHash('md4')
+                .update(this.webpackConfig.outputPath)
+                .digest('hex')
+                .slice(0, 8);
+            const tmpFilename = path.join(os.tmpdir(), '_webpack_encore_tmp_module' + staticHashKey + '.js');
             const pathToRequire = path.resolve(this.webpackConfig.getContext(), this.webpackConfig.sharedCommonsEntryFile);
             fs.writeFileSync(
-                tmpFileObject.name,
+                tmpFilename,
                 `require('${stringEscaper(pathToRequire)}')`
             );
 
-            entry[sharedEntryTmpName] = tmpFileObject.name;
+            entry[sharedEntryTmpName] = tmpFilename;
         }
 
         if (this.webpackConfig.copyFilesConfigs.length > 0) {
diff --git a/lib/plugins/shared-entry-concat.js b/lib/plugins/shared-entry-concat.js
index c49def11..ce1e9f42 100644
--- a/lib/plugins/shared-entry-concat.js
+++ b/lib/plugins/shared-entry-concat.js
@@ -24,8 +24,7 @@ module.exports = function(plugins, webpackConfig) {
 
     plugins.push({
         plugin: new SharedEntryConcatPlugin(
-            webpackConfig.sharedCommonsEntryName,
-            webpackConfig.outputPath
+            webpackConfig.sharedCommonsEntryName
         ),
         priority: PluginPriorities.SharedEntryContactPlugin
     });
diff --git a/lib/webpack/shared-entry-concat-plugin.js b/lib/webpack/shared-entry-concat-plugin.js
index fc48fb4a..0f57f7b4 100644
--- a/lib/webpack/shared-entry-concat-plugin.js
+++ b/lib/webpack/shared-entry-concat-plugin.js
@@ -9,17 +9,15 @@
 
 'use strict';
 
-const fs = require('fs');
-const path = require('path');
 const sharedEntryTmpName = require('../utils/sharedEntryTmpName');
+const RawSource = require('webpack-sources/lib/RawSource');
 
-function SharedEntryConcatPlugin(sharedEntryName, buildDir) {
+function SharedEntryConcatPlugin(sharedEntryName) {
     this.sharedEntryName = sharedEntryName;
-    this.buildDir = buildDir;
 }
 
-function getChunkFilename(stats, chunkName) {
-    const chunk = stats.compilation.namedChunks.get(chunkName);
+function getChunkFilename(compilation, chunkName) {
+    const chunk = compilation.namedChunks.get(chunkName);
 
     if (!chunk) {
         throw new Error(`Cannot find chunk ${chunkName}`);
@@ -36,12 +34,21 @@ function getChunkFilename(stats, chunkName) {
     return jsFiles[0];
 }
 
-SharedEntryConcatPlugin.prototype.apply = function(compiler) {
-    const done = (stats) => {
-        if (stats.hasErrors()) {
-            return;
-        }
+/**
+ * @param {Source} asset
+ * @return {string}
+ */
+function getAssetSource(asset) {
+    let content = asset.source();
+    if (Buffer.isBuffer(content)) {
+        content = Buffer.toString('utf-8');
+    }
 
+    return content;
+}
+
+SharedEntryConcatPlugin.prototype.apply = function(compiler) {
+    const emit = (compilation) => {
         /*
          * This is a hack. See ConfigGenerator.buildEntryConfig()
          * for other details.
@@ -59,28 +66,31 @@ SharedEntryConcatPlugin.prototype.apply = function(compiler) {
          * executed. This fixes that.
          */
 
-        const sharedEntryOutputFile = path.join(this.buildDir, getChunkFilename(stats, this.sharedEntryName));
-        const tmpEntryBootstrapFile = path.join(this.buildDir, getChunkFilename(stats, sharedEntryTmpName));
+        const sharedEntryOutputFile = getChunkFilename(compilation, this.sharedEntryName);
+        const tmpEntryFile = getChunkFilename(compilation, sharedEntryTmpName);
+        const assets = compilation.assets;
+
+        const sharedEntryAsset = assets[sharedEntryOutputFile];
+        const tmpEntryAsset = assets[tmpEntryFile];
 
-        if (!fs.existsSync(sharedEntryOutputFile)) {
+        if (typeof sharedEntryAsset === 'undefined') {
             throw new Error(`Could not find shared entry output file: ${sharedEntryOutputFile}`);
         }
 
-        if (!fs.existsSync(tmpEntryBootstrapFile)) {
-            throw new Error(`Could not find temporary shared entry bootstrap file: ${tmpEntryBootstrapFile}`);
+        if (typeof assets[tmpEntryFile] === 'undefined') {
+            throw new Error(`Could not find temporary shared entry bootstrap file: ${tmpEntryFile}`);
         }
 
-        fs.writeFileSync(
-            sharedEntryOutputFile,
-            [fs.readFileSync(sharedEntryOutputFile), fs.readFileSync(tmpEntryBootstrapFile)].join('\n')
+        assets[sharedEntryOutputFile] = new RawSource(
+            [getAssetSource(sharedEntryAsset), getAssetSource(tmpEntryAsset)].join('\n')
         );
 
-        fs.unlinkSync(tmpEntryBootstrapFile);
+        delete(assets[tmpEntryFile]);
     };
 
-    compiler.hooks.done.tap(
+    compiler.hooks.emit.tap(
         { name: 'SharedEntryConcatPlugin' },
-        done
+        emit
     );
 };
 
diff --git a/package.json b/package.json
index c5c025d4..f5abc338 100644
--- a/package.json
+++ b/package.json
@@ -52,6 +52,7 @@
     "webpack-cli": "^3.0.0",
     "webpack-dev-server": "^3.1.4",
     "webpack-manifest-plugin": "^2.0.2",
+    "webpack-sources": "^1.3.0",
     "yargs": "^8.0.1"
   },
   "devDependencies": {