diff --git a/packages/next/src/build/webpack/plugins/flight-client-entry-plugin.ts b/packages/next/src/build/webpack/plugins/flight-client-entry-plugin.ts
index 561473df9402d..7927f2748752e 100644
--- a/packages/next/src/build/webpack/plugins/flight-client-entry-plugin.ts
+++ b/packages/next/src/build/webpack/plugins/flight-client-entry-plugin.ts
@@ -915,7 +915,7 @@ export class FlightClientEntryPlugin {
 
     assets[`${this.assetPrefix}${SERVER_REFERENCE_MANIFEST}.js`] =
       new sources.RawSource(
-        `self.__RSC_SERVER_MANIFEST=${json}`
+        `self.__RSC_SERVER_MANIFEST=${JSON.stringify(json)}`
       ) as unknown as webpack.sources.RawSource
     assets[`${this.assetPrefix}${SERVER_REFERENCE_MANIFEST}.json`] =
       new sources.RawSource(json) as unknown as webpack.sources.RawSource