diff --git a/client/src/reducers/index.ts b/client/src/reducers/index.ts
index 8f07bfe4..e12aae34 100644
--- a/client/src/reducers/index.ts
+++ b/client/src/reducers/index.ts
@@ -63,4 +63,6 @@ const Reducer = undoable(
 
 const store = createStore(Reducer, applyMiddleware(thunk, annoMatrixGC));
 
+export type RootState = ReturnType<typeof store.getState>;
+
 export default store;