diff --git a/src/compiler/index.ts b/src/compiler/index.ts
index 76eb45d37f..57277ac756 100644
--- a/src/compiler/index.ts
+++ b/src/compiler/index.ts
@@ -3,5 +3,5 @@ export { default as parse } from './parse/index';
 export { default as preprocess } from './preprocess/index';
 export { walk } from 'estree-walker';
 
-export const VERSION = '__VERSION__';
+export const VERSION: string = '__VERSION__';
 // additional exports added through generate-type-definitions.js