diff --git a/rollup.config.js b/rollup.config.js
index 0b5ffa3b067..40708b162c0 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -193,7 +193,7 @@ function createConfig(format, output, plugins = []) {
     if (isBundlerESMBuild) {
       Object.assign(replacements, {
         // preserve to be handled by bundlers
-        __DEV__: `process.env.NODE_ENV !== 'production'`
+        __DEV__: String(process.env.NODE_ENV !== 'production')
       })
     }