diff --git a/packages/effect-fc/src/Lens.ts b/packages/effect-fc/src/Lens.ts
index 112de62..a3daf7e 100644
--- a/packages/effect-fc/src/Lens.ts
+++ b/packages/effect-fc/src/Lens.ts
@@ -199,7 +199,7 @@ export const mapStream: {
 ): Lens<A, ER, EW, RR, RW> => make({
     get get() { return self.get },
     get changes() { return f(self.changes) },
-    modify: self.modify,
+    get modify() { return self.modify },
 }))