diff --git a/demo/src/activities/Article.tsx b/demo/src/activities/Article.tsx
index 27b3df957..74e793e68 100644
--- a/demo/src/activities/Article.tsx
+++ b/demo/src/activities/Article.tsx
@@ -1,3 +1,4 @@
+import type { InferActivityParams } from "@stackflow/config";
 import {
   type ActivityComponentType,
   useActivityParams,
@@ -19,7 +20,7 @@ declare module "@stackflow/config" {
   }
 }
 
-const Article: ActivityComponentType<"Article"> = ({ params }) => {
+const Article = ({ params }: { params: InferActivityParams<"Article"> }) => {
   const { title } = useActivityParams<"Article">();
   const { imageUrl, recommenderCards } = useLoaderData<typeof articleLoader>();
 
diff --git a/integrations/react/src/__internal__/ActivityComponentType.ts b/integrations/react/src/__internal__/ActivityComponentType.ts
index d325bcfde..c3429a4a0 100644
--- a/integrations/react/src/__internal__/ActivityComponentType.ts
+++ b/integrations/react/src/__internal__/ActivityComponentType.ts
@@ -1,6 +1,4 @@
-import type { LazyActivityComponentType } from "./LazyActivityComponentType";
 import type { StaticActivityComponentType } from "./StaticActivityComponentType";
 
 export type ActivityComponentType<T extends { [K in keyof T]: any } = {}> =
-  | StaticActivityComponentType<T>
-  | LazyActivityComponentType<T>;
+  StaticActivityComponentType<T>;
diff --git a/integrations/react/src/future/ActivityComponentType.tsx b/integrations/react/src/future/ActivityComponentType.tsx
index 05fcf1259..dadc84775 100644
--- a/integrations/react/src/future/ActivityComponentType.tsx
+++ b/integrations/react/src/future/ActivityComponentType.tsx
@@ -2,7 +2,11 @@ import type {
   InferActivityParams,
   RegisteredActivityName,
 } from "@stackflow/config";
-import type React from "react";
+import type { LazyActivityComponentType } from "../__internal__/LazyActivityComponentType";
+import type { StaticActivityComponentType } from "../__internal__/StaticActivityComponentType";
 
 export type ActivityComponentType<ActivityName extends RegisteredActivityName> =
-  React.ComponentType<{ params: InferActivityParams<ActivityName> }>;
+  | StaticActivityComponentType<InferActivityParams<ActivityName>>
+  | LazyActivityComponentType<InferActivityParams<ActivityName>>;
+
+export type { StaticActivityComponentType, LazyActivityComponentType };
diff --git a/integrations/react/src/future/loader/loaderPlugin.tsx b/integrations/react/src/future/loader/loaderPlugin.tsx
index 744768db8..43784c2e1 100644
--- a/integrations/react/src/future/loader/loaderPlugin.tsx
+++ b/integrations/react/src/future/loader/loaderPlugin.tsx
@@ -2,8 +2,8 @@ import type {
   ActivityDefinition,
   RegisteredActivityName,
 } from "@stackflow/config";
-import type { ActivityComponentType } from "../../__internal__/ActivityComponentType";
 import type { StackflowReactPlugin } from "../../__internal__/StackflowReactPlugin";
+import type { ActivityComponentType } from "../ActivityComponentType";
 import type { StackflowInput } from "../stackflow";
 
 export function loaderPlugin<
diff --git a/integrations/react/src/future/stackflow.tsx b/integrations/react/src/future/stackflow.tsx
index a5807619d..0370bbc98 100644
--- a/integrations/react/src/future/stackflow.tsx
+++ b/integrations/react/src/future/stackflow.tsx
@@ -11,7 +11,6 @@ import {
   makeEvent,
 } from "@stackflow/core";
 import React, { useMemo } from "react";
-import type { ActivityComponentType } from "../__internal__/ActivityComponentType";
 import MainRenderer from "../__internal__/MainRenderer";
 import { makeActivityId } from "../__internal__/activity";
 import { CoreProvider } from "../__internal__/core";
@@ -19,6 +18,7 @@ import { PluginsProvider } from "../__internal__/plugins";
 import { isBrowser, makeRef } from "../__internal__/utils";
 import type { StackflowReactPlugin } from "../stable";
 import type { Actions } from "./Actions";
+import type { ActivityComponentType } from "./ActivityComponentType";
 import { ConfigProvider } from "./ConfigProvider";
 import type { StackComponentType } from "./StackComponentType";
 import type { StepActions } from "./StepActions";