diff --git a/node-swc/src/index.ts b/node-swc/src/index.ts
index e74e233c4a8a..d673f1e6f2a4 100644
--- a/node-swc/src/index.ts
+++ b/node-swc/src/index.ts
@@ -38,7 +38,7 @@ const bindings: typeof import('./binding') = (() => {
 /**
  * Version of the swc binding.
  */
-export const version = require("./package.json").version;
+export const version: string = require("./package.json").version;
 
 export function plugins(ps: Plugin[]): Plugin {
   return mod => {