diff --git a/scripts/build/bundler.mjs b/scripts/build/bundler.mjs
index b38e7e98d..63246e362 100644
--- a/scripts/build/bundler.mjs
+++ b/scripts/build/bundler.mjs
@@ -238,6 +238,7 @@ async function runBuild(bundle, esbuildOptions, buildOptions) {
 
   await esbuild.build({
     ...esbuildOptions,
+    define: {},
     plugins: plugins.filter(({ name }) => name === "umd"),
     entryPoints: [outfile],
     allowOverwrite: true,