diff --git a/packages/effect-fc/src/Result.ts b/packages/effect-fc/src/Result.ts
index 9894a5a..123e747 100644
--- a/packages/effect-fc/src/Result.ts
+++ b/packages/effect-fc/src/Result.ts
@@ -223,9 +223,7 @@ export const unsafeForkEffect = Effect.fnUntraced(function* <A, E, R, P = never>
                 ([latest, stream]) => Stream.concat(Stream.make(latest), stream),
             ))
         },
-        modify: <B, E1, R1>(
-            f: (a: Result<A, E, P>) => Effect.Effect<readonly [B, Result<A, E, P>], E1, R1>
-        ): Effect.Effect<B, E1, R1> => Ref.get(ref).pipe(
+        modify: f => Ref.get(ref).pipe(
             Effect.flatMap(f),
             Effect.flatMap(([b, a]) => Ref.set(ref, a).pipe(
                 Effect.as(b),