diff --git a/tracker/tracker-vuex/src/index.ts b/tracker/tracker-vuex/src/index.ts
index 37cd0d2cc..f8d8c1dba 100644
--- a/tracker/tracker-vuex/src/index.ts
+++ b/tracker/tracker-vuex/src/index.ts
@@ -46,7 +46,7 @@ export default function(opts: Partial<Options> = {}) {
     }
     const encoder = new Encoder(sha1, 50);
     const state = {};
-    return (store, storeName) => {
+    return (storeName: string) => (store) => {
       // Vuex
       if (store.subscribe) {
         const randomId = Math.random().toString(36).substring(2, 9)