diff --git a/packages/react-dom/src/client/ReactDOM.js b/packages/react-dom/src/client/ReactDOM.js
index 938cf98ca6b0a..7a7b4de04a5cb 100644
--- a/packages/react-dom/src/client/ReactDOM.js
+++ b/packages/react-dom/src/client/ReactDOM.js
@@ -39,6 +39,7 @@ import {
   findHostInstanceWithWarning,
   flushPassiveEffects,
   IsThisRendererActing,
+  attemptSynchronousHydration,
 } from 'react-reconciler/inline.dom';
 import {createPortal as createPortalImpl} from 'shared/ReactPortal';
 import {canUseDOM} from 'shared/ExecutionEnvironment';
@@ -74,6 +75,7 @@ import {
 } from './ReactDOMComponentTree';
 import {restoreControlledState} from './ReactDOMComponent';
 import {dispatchEvent} from '../events/ReactDOMEventListener';
+import {setAttemptSynchronousHydration} from '../events/ReactDOMEventReplaying';
 import {eagerlyTrapReplayableEvents} from '../events/ReactDOMEventReplaying';
 import {
   ELEMENT_NODE,
@@ -83,6 +85,8 @@ import {
 } from '../shared/HTMLNodeType';
 import {ROOT_ATTRIBUTE_NAME} from '../shared/DOMProperty';
 
+setAttemptSynchronousHydration(attemptSynchronousHydration);
+
 const ReactCurrentOwner = ReactSharedInternals.ReactCurrentOwner;
 
 let topLevelUpdateWarnings;
diff --git a/packages/react-dom/src/events/ReactDOMEventReplaying.js b/packages/react-dom/src/events/ReactDOMEventReplaying.js
index aa9e8270c452a..76ce3c7158232 100644
--- a/packages/react-dom/src/events/ReactDOMEventReplaying.js
+++ b/packages/react-dom/src/events/ReactDOMEventReplaying.js
@@ -20,7 +20,6 @@ import {
   unstable_scheduleCallback as scheduleCallback,
   unstable_NormalPriority as NormalPriority,
 } from 'scheduler';
-import {attemptSynchronousHydration} from 'react-reconciler/inline.dom';
 import {
   attemptToDispatchEvent,
   trapEventForResponderEventSystem,
@@ -32,6 +31,12 @@ import {
 import {getInstanceFromNode} from '../client/ReactDOMComponentTree';
 import {unsafeCastDOMTopLevelTypeToString} from 'legacy-events/TopLevelEventTypes';
 
+let attemptSynchronousHydration: (fiber: Object) => void;
+
+export function setAttemptSynchronousHydration(fn: (fiber: Object) => void) {
+  attemptSynchronousHydration = fn;
+}
+
 // TODO: Upgrade this definition once we're on a newer version of Flow that
 // has this definition built-in.
 type PointerEvent = Event & {