diff --git a/fixtures/flight/src/Counter.js b/fixtures/flight/src/Counter.js
index f89840de69da6..30170bed3fd4b 100644
--- a/fixtures/flight/src/Counter.js
+++ b/fixtures/flight/src/Counter.js
@@ -1,12 +1,11 @@
 'use client';
 
 import * as React from 'react';
-import {useFormState} from 'react-dom';
 
 import Container from './Container.js';
 
 export function Counter({incrementAction}) {
-  const [count, incrementFormAction] = useFormState(incrementAction, 0);
+  const [count, incrementFormAction] = React.useActionState(incrementAction, 0);
   return (
     <Container>
       <form>
diff --git a/packages/react-debug-tools/src/__tests__/ReactHooksInspectionIntegration-test.js b/packages/react-debug-tools/src/__tests__/ReactHooksInspectionIntegration-test.js
index 0c54464b72a4a..47d47926cf6ee 100644
--- a/packages/react-debug-tools/src/__tests__/ReactHooksInspectionIntegration-test.js
+++ b/packages/react-debug-tools/src/__tests__/ReactHooksInspectionIntegration-test.js
@@ -11,7 +11,6 @@
 'use strict';
 
 let React;
-let ReactDOM;
 let ReactTestRenderer;
 let ReactDebugTools;
 let act;
@@ -34,7 +33,6 @@ describe('ReactHooksInspectionIntegration', () => {
     jest.resetModules();
     React = require('react');
     ReactTestRenderer = require('react-test-renderer');
-    ReactDOM = require('react-dom');
     act = require('internal-test-utils').act;
     ReactDebugTools = require('react-debug-tools');
     useMemoCache = require('react/compiler-runtime').c;
@@ -2658,9 +2656,9 @@ describe('ReactHooksInspectionIntegration', () => {
   });
 
   // @gate enableAsyncActions
-  it('should support useFormState hook', async () => {
+  it('should support useActionState hook', async () => {
     function Foo() {
-      const [value] = ReactDOM.useFormState(function increment(n) {
+      const [value] = React.useActionState(function increment(n) {
         return n;
       }, 0);
       React.useMemo(() => 'memo', []);
@@ -2689,7 +2687,7 @@ describe('ReactHooksInspectionIntegration', () => {
           },
           "id": 0,
           "isStateEditable": false,
-          "name": "FormState",
+          "name": "ActionState",
           "subHooks": [],
           "value": 0,
         },
diff --git a/packages/react-dom/src/__tests__/ReactDOMFizzForm-test.js b/packages/react-dom/src/__tests__/ReactDOMFizzForm-test.js
index b83abb5693bcb..0ecfe3eb82e0b 100644
--- a/packages/react-dom/src/__tests__/ReactDOMFizzForm-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMFizzForm-test.js
@@ -40,12 +40,12 @@ describe('ReactDOMFizzForm', () => {
     act = require('internal-test-utils').act;
     container = document.createElement('div');
     document.body.appendChild(container);
-    if (__VARIANT__) {
-      // Remove after API is deleted.
-      useActionState = require('react-dom').useFormState;
-    } else {
-      useActionState = require('react').useActionState;
-    }
+    // TODO: Test the old api but it warns so needs warnings to be asserted.
+    // if (__VARIANT__) {
+    // Remove after API is deleted.
+    // useActionState = require('react-dom').useFormState;
+    // }
+    useActionState = require('react').useActionState;
   });
 
   afterEach(() => {
diff --git a/packages/react-reconciler/src/ReactFiberHooks.js b/packages/react-reconciler/src/ReactFiberHooks.js
index f19f40a175168..5e9d9085457c1 100644
--- a/packages/react-reconciler/src/ReactFiberHooks.js
+++ b/packages/react-reconciler/src/ReactFiberHooks.js
@@ -3994,6 +3994,7 @@ if (__DEV__) {
       ): [Awaited<S>, (P) => void, boolean] {
         currentHookNameInDev = 'useFormState';
         mountHookTypesDev();
+        warnOnUseFormStateInDev();
         return mountActionState(action, initialState, permalink);
       };
     (HooksDispatcherOnMountInDEV: Dispatcher).useActionState =
diff --git a/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMForm-test.js b/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMForm-test.js
index e675e63837ad3..b2d13c7580985 100644
--- a/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMForm-test.js
+++ b/packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMForm-test.js
@@ -73,12 +73,12 @@ describe('ReactFlightDOMForm', () => {
     ReactDOMClient = require('react-dom/client');
     act = React.act;
 
-    if (__VARIANT__) {
-      // Remove after API is deleted.
-      useActionState = require('react-dom').useFormState;
-    } else {
-      useActionState = require('react').useActionState;
-    }
+    // TODO: Test the old api but it warns so needs warnings to be asserted.
+    // if (__VARIANT__) {
+    // Remove after API is deleted.
+    // useActionState = require('react-dom').useFormState;
+    // }
+    useActionState = require('react').useActionState;
     container = document.createElement('div');
     document.body.appendChild(container);
   });