diff --git a/runtime.d.ts b/runtime.d.ts
index 6ab8127e..0f57c07e 100644
--- a/runtime.d.ts
+++ b/runtime.d.ts
@@ -2967,6 +2967,6 @@ interface Main {
     log(e: string | Error, error: boolean): void
 }
 
-declare var core: CoreMixin
+declare let core: CoreMixin
 declare let flags: { [x: string]: any }
 declare let hero : CoreMixin['status']['hero']
\ No newline at end of file