diff --git a/packages/effect-lens/src/Lens.ts b/packages/effect-lens/src/Lens.ts
index fd9a55d..50b629c 100644
--- a/packages/effect-lens/src/Lens.ts
+++ b/packages/effect-lens/src/Lens.ts
@@ -82,7 +82,7 @@ export declare namespace LensLazyImpl {
         readonly get: Effect.Effect<A, ER, RR>
         readonly changes: Stream.Stream<A, ER, RR>
         readonly commit: (a: A) => Effect.Effect<void, EW, RW>
-        readonly withLock: <A1, E1, R1>(self: Effect.Effect<A1, E1, R1>) => Effect.Effect<A1, E1, R1>
+        readonly withLock: <A1, E1, R1>(self: Effect.Effect<A1, E1, R1>) => Effect.Effect<A1, EW | E1, RW | R1>
     }
 }
 
@@ -274,7 +274,7 @@ export const unwrap = <A, ER, EW, RR, RW, E1, R1>(
         effect,
         l => Effect.flatMap(asLensImpl(l).access, frame => frame.commit(Effect.succeed(a))),
     ),
-    withLock: identity,
+    withLock: self => Effect.flatMap(effect, l => asLensImpl(l).withLock(self)),
 })
 
 /**