diff --git a/packages/effect-fc/src/types/SubscriptionSubRef.ts b/packages/effect-fc/src/types/SubscriptionSubRef.ts
index 88baee8..ead45f1 100644
--- a/packages/effect-fc/src/types/SubscriptionSubRef.ts
+++ b/packages/effect-fc/src/types/SubscriptionSubRef.ts
@@ -105,14 +105,26 @@ export const makeFromPath = <
     (parentValue, value) => Option.getOrThrow(PropertyPath.immutableSet(parentValue, path, value)),
 )
 
-export const makeFromChunkRef = <A, B extends SubscriptionRef.SubscriptionRef<Chunk.Chunk<any> | Chunk.NonEmptyChunk<any>>>(
-    parent: B,
+export const makeFromChunkRef: {
+    <B extends SubscriptionRef.SubscriptionRef<Chunk.NonEmptyChunk<any>>>(
+        parent: B,
+        index: number,
+    ): SubscriptionSubRef<
+        Effect.Effect.Success<B> extends Chunk.NonEmptyChunk<infer A> ? A : never,
+        B
+    >
+    <B extends SubscriptionRef.SubscriptionRef<Chunk.Chunk<any>>>(
+        parent: B,
+        index: number,
+    ): SubscriptionSubRef<
+        Effect.Effect.Success<B> extends Chunk.Chunk<infer A> ? A : never,
+        B
+    >
+} = (
+    parent: SubscriptionRef.SubscriptionRef<Chunk.Chunk<any>>,
     index: number,
-): SubscriptionSubRef<
-    Effect.Effect.Success<B> extends Chunk.Chunk<infer A> ? A : never,
-    B
-> => new SubscriptionSubRefImpl(
-    parent as SubscriptionRef.SubscriptionRef<Chunk.Chunk<any>>,
+) => new SubscriptionSubRefImpl(
+    parent,
     parentValue => Chunk.unsafeGet(parentValue, index),
     (parentValue, value) => Chunk.replace(parentValue, index, value),
 ) as any
diff --git a/packages/example/src/routes/dev/memo.tsx b/packages/example/src/routes/dev/memo.tsx
index 4acd3cb..5b10906 100644
--- a/packages/example/src/routes/dev/memo.tsx
+++ b/packages/example/src/routes/dev/memo.tsx
@@ -10,8 +10,8 @@ import * as React from "react"
 
 const RouteComponent = Component.make(function* RouteComponent() {
     const [value, setValue] = React.useState("")
-    const myRef = yield* SubscriptionRef.make(Chunk.make({ name: "person 1" } as const))
-    // const myRef = yield* SubscriptionRef.make(Chunk.empty<{ readonly name: "person 1" }>())
+    // const myRef = yield* SubscriptionRef.make(Chunk.make({ name: "person 1" } as const))
+    const myRef = yield* SubscriptionRef.make(Chunk.empty<{ readonly name: "person 1" }>())
     const mySubRef = SubscriptionSubRef.makeFromChunkRef(myRef, 0)
 
     return (