diff --git a/src/core/types/external.ts b/src/core/types/external.ts
index 9bb48813..dd2c4f40 100644
--- a/src/core/types/external.ts
+++ b/src/core/types/external.ts
@@ -426,6 +426,7 @@ export interface ContentScriptDefinition extends ExcludableEntrypoint {
 
 export interface BackgroundScriptDefintition extends ExcludableEntrypoint {
   type?: 'module';
+  persistent?: boolean;
   main(): void;
 }