diff --git a/packages/react-dom/src/client/ReactDOM.js b/packages/react-dom/src/client/ReactDOM.js
index 9e4ab0e59faf5..eade4ea474c77 100644
--- a/packages/react-dom/src/client/ReactDOM.js
+++ b/packages/react-dom/src/client/ReactDOM.js
@@ -28,7 +28,6 @@ import {
   flushSync,
   flushControlled,
   injectIntoDevTools,
-  flushPassiveEffects,
   IsThisRendererActing,
   act,
   attemptSynchronousHydration,
@@ -156,7 +155,7 @@ function renderSubtreeIntoContainer(
 }
 
 const Internals = {
-  // Keep in sync with ReactTestUtils.js, and ReactTestUtilsAct.js.
+  // Keep in sync with ReactTestUtils.js.
   // This is an array for better minification.
   Events: [
     getInstanceFromNode,
@@ -164,11 +163,10 @@ const Internals = {
     getFiberCurrentPropsFromNode,
     enqueueStateRestore,
     restoreStateIfNeeded,
-    flushPassiveEffects,
-    // TODO: This is related to `act`, not events. Move to separate key?
-    IsThisRendererActing,
-    act,
   ],
+  act,
+  // TODO: Temporary. Only used by our internal version of `act. Will remove.
+  IsThisRendererActing,
 };
 
 export {
diff --git a/packages/react-dom/src/test-utils/ReactTestUtils.js b/packages/react-dom/src/test-utils/ReactTestUtils.js
index 2db21c264866d..69c1a6afcff3a 100644
--- a/packages/react-dom/src/test-utils/ReactTestUtils.js
+++ b/packages/react-dom/src/test-utils/ReactTestUtils.js
@@ -25,18 +25,17 @@ import {
 } from 'shared/ReactErrorUtils';
 import isArray from 'shared/isArray';
 
-// Keep in sync with ReactDOM.js, and ReactTestUtilsAct.js:
-const EventInternals =
-  ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Events;
+// Keep in sync with ReactDOM.js:
+const SecretInternals =
+  ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+const EventInternals = SecretInternals.Events;
 const getInstanceFromNode = EventInternals[0];
 const getNodeFromInstance = EventInternals[1];
 const getFiberCurrentPropsFromNode = EventInternals[2];
 const enqueueStateRestore = EventInternals[3];
 const restoreStateIfNeeded = EventInternals[4];
-// const flushPassiveEffects = EventInternals[5];
-// TODO: This is related to `act`, not events. Move to separate key?
-// const IsThisRendererActing = EventInternals[6];
-const act = EventInternals[7];
+
+const act = SecretInternals.act;
 
 function Event(suffix) {}
 
diff --git a/packages/react-dom/src/test-utils/ReactTestUtilsInternalAct.js b/packages/react-dom/src/test-utils/ReactTestUtilsInternalAct.js
index 77fd1779ee56a..3adc786eed5fa 100644
--- a/packages/react-dom/src/test-utils/ReactTestUtilsInternalAct.js
+++ b/packages/react-dom/src/test-utils/ReactTestUtilsInternalAct.js
@@ -14,16 +14,9 @@ import ReactSharedInternals from 'shared/ReactSharedInternals';
 import enqueueTask from 'shared/enqueueTask';
 import * as Scheduler from 'scheduler';
 
-// Keep in sync with ReactDOM.js, and ReactTestUtils.js:
-const EventInternals =
-  ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Events;
-// const getInstanceFromNode = EventInternals[0];
-// const getNodeFromInstance = EventInternals[1];
-// const getFiberCurrentPropsFromNode = EventInternals[2];
-// const enqueueStateRestore = EventInternals[3];
-// const restoreStateIfNeeded = EventInternals[4];
-// const flushPassiveEffects = EventInternals[5];
-const IsThisRendererActing = EventInternals[6];
+const SecretInternals =
+  ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+const IsThisRendererActing = SecretInternals.IsThisRendererActing;
 
 const batchedUpdates = ReactDOM.unstable_batchedUpdates;