diff --git a/packages/effect-fc-next/src/ReactRuntime.ts b/packages/effect-fc-next/src/ReactRuntime.ts
index 87023f3..29c738a 100644
--- a/packages/effect-fc-next/src/ReactRuntime.ts
+++ b/packages/effect-fc-next/src/ReactRuntime.ts
@@ -26,7 +26,7 @@ export const make = <R, ER>(
 ): ReactRuntime<Layer.Success<typeof preludeLayer> | R, ER> => Object.setPrototypeOf(
     Object.assign(function() {}, {
         runtime: ManagedRuntime.make(
-            Layer.mergeAll(preludeLayer, layer),
+            Layer.merge(preludeLayer, layer),
             { memoMap },
         ),
         // biome-ignore lint/style/noNonNullAssertion: context initialization