diff --git a/packages/react-reconciler/src/ReactInternalTypes.js b/packages/react-reconciler/src/ReactInternalTypes.js
index 859da37cadf32..7a6766f5c92c4 100644
--- a/packages/react-reconciler/src/ReactInternalTypes.js
+++ b/packages/react-reconciler/src/ReactInternalTypes.js
@@ -430,7 +430,7 @@ export type Dispatcher = {
   ): T,
   useId(): string,
   useCacheRefresh?: () => <T>(?() => T, ?T) => void,
-  useMemoCache?: (size: number) => Array<any>,
+  useMemoCache: (size: number) => Array<any>,
   useHostTransitionStatus: () => TransitionStatus,
   useOptimistic: <S, A>(
     passthrough: S,
diff --git a/packages/react-server/src/ReactFizzHooks.js b/packages/react-server/src/ReactFizzHooks.js
index 83f51c6fb248e..d346bdff0c58f 100644
--- a/packages/react-server/src/ReactFizzHooks.js
+++ b/packages/react-server/src/ReactFizzHooks.js
@@ -834,6 +834,7 @@ export const HooksDispatcher: Dispatcher = supportsClientAPIs
       useActionState,
       useFormState: useActionState,
       useHostTransitionStatus,
+      useMemoCache,
     }
   : {
       readContext,