diff --git a/src/index.ts b/src/index.ts
index 0d33296..b820cd3 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -11,7 +11,7 @@ export {
     PLSQL,
 } from './parser';
 
-export {
+export type {
     MySqlParserListener,
     MySqlParserVisitor,
     FlinkSqlParserListener,