diff --git a/packages/react-reconciler/src/ReactInternalTypes.js b/packages/react-reconciler/src/ReactInternalTypes.js
index 7f01daa5240da..a672b9669abcf 100644
--- a/packages/react-reconciler/src/ReactInternalTypes.js
+++ b/packages/react-reconciler/src/ReactInternalTypes.js
@@ -383,9 +383,7 @@ export type Dispatcher = {
     create: () => (() => void) | void,
     deps: Array<mixed> | void | null,
   ): void,
-  useEffectEvent?: <Args, Return, F: (...Array<Args>) => Return>(
-    callback: F,
-  ) => F,
+  useEffectEvent?: <Args, F: (...Array<Args>) => mixed>(callback: F) => F,
   useInsertionEffect(
     create: () => (() => void) | void,
     deps: Array<mixed> | void | null,
diff --git a/packages/react/src/ReactHooks.js b/packages/react/src/ReactHooks.js
index 7f1bc8d5e133b..6d157cbc60289 100644
--- a/packages/react/src/ReactHooks.js
+++ b/packages/react/src/ReactHooks.js
@@ -218,24 +218,26 @@ export function useSyncExternalStore<T>(
 
 export function useCacheRefresh(): <T>(?() => T, ?T) => void {
   const dispatcher = resolveDispatcher();
-  // $FlowFixMe This is unstable, thus optional
+  // $FlowFixMe[not-a-function] This is unstable, thus optional
   return dispatcher.useCacheRefresh();
 }
 
 export function use<T>(usable: Usable<T>): T {
   const dispatcher = resolveDispatcher();
-  // $FlowFixMe This is unstable, thus optional
+  // $FlowFixMe[not-a-function] This is unstable, thus optional
   return dispatcher.use(usable);
 }
 
 export function useMemoCache(size: number): Array<any> {
   const dispatcher = resolveDispatcher();
-  // $FlowFixMe This is unstable, thus optional
+  // $FlowFixMe[not-a-function] This is unstable, thus optional
   return dispatcher.useMemoCache(size);
 }
 
-export function useEffectEvent<T>(callback: T): void {
+export function useEffectEvent<Args, F: (...Array<Args>) => mixed>(
+  callback: F,
+): F {
   const dispatcher = resolveDispatcher();
-  // $FlowFixMe This is unstable, thus optional
+  // $FlowFixMe[not-a-function] This is unstable, thus optional
   return dispatcher.useEffectEvent(callback);
 }