diff --git a/lib/pipeline/webpack.config.js b/lib/pipeline/webpack.config.js
index 6920f0d76..a350e25d5 100644
--- a/lib/pipeline/webpack.config.js
+++ b/lib/pipeline/webpack.config.js
@@ -155,7 +155,8 @@ const base = {
     filename: (chunkData) => chunkData.chunk.name,
     // globalObject workaround for node-compatible UMD builds with webpack 4
     // see: https://github.com/webpack/webpack/issues/6522#issuecomment-371120689
-    globalObject: 'typeof self !== \'undefined\' ? self : this',
+    // see: https://github.com/webpack/webpack/issues/6522#issuecomment-418864518
+    globalObject: '(typeof self !== \'undefined\' ? self : this)',
     libraryTarget: 'umd',
     path: buildDir
   },