diff --git a/compiler/forget/packages/playground/lib/patchUseMemoCache.ts b/compiler/forget/packages/playground/lib/patchUseMemoCache.ts
index 481c6d0636..96a1f15e59 100644
--- a/compiler/forget/packages/playground/lib/patchUseMemoCache.ts
+++ b/compiler/forget/packages/playground/lib/patchUseMemoCache.ts
@@ -130,7 +130,7 @@ export default function patchUseMemoCache(reactSource: string) {
       () => true, // always read-only
     );
 
-    React.useMemoCache = useMemoCache;
+    React.unstable_useMemoCache = React.useMemoCache = useMemoCache;
 
     export default React;
   `;
diff --git a/compiler/forget/src/BackEnd/JSGen.ts b/compiler/forget/src/BackEnd/JSGen.ts
index 1a97c4872c..eb59965327 100644
--- a/compiler/forget/src/BackEnd/JSGen.ts
+++ b/compiler/forget/src/BackEnd/JSGen.ts
@@ -36,7 +36,7 @@ export function run(lirProg: LIR.Prog, context: CompilerContext) {
         /*specifier*/ [
           t.importSpecifier(
             t.identifier("useMemoCache"),
-            t.identifier("useMemoCache")
+            t.identifier("unstable_useMemoCache")
           ),
         ],
         /*source*/ t.stringLiteral("react")
diff --git a/compiler/forget/src/__tests__/e2e/hello.e2e.js b/compiler/forget/src/__tests__/e2e/hello.e2e.js
index d35f16f9c2..ed76812cdb 100644
--- a/compiler/forget/src/__tests__/e2e/hello.e2e.js
+++ b/compiler/forget/src/__tests__/e2e/hello.e2e.js
@@ -10,7 +10,7 @@ import * as React from "react";
 import { render } from "@testing-library/react";
 import { expectLogsAndClear, log } from "./expectLogs";
 
-React.useMemoCache = useMemoCacheStub;
+React.unstable_useMemoCache = useMemoCacheStub;
 
 function Hello({ name }) {
   "use forget";
diff --git a/compiler/forget/src/__tests__/e2e/update-button.e2e.js b/compiler/forget/src/__tests__/e2e/update-button.e2e.js
index 008bc5b59d..11cae8dc82 100644
--- a/compiler/forget/src/__tests__/e2e/update-button.e2e.js
+++ b/compiler/forget/src/__tests__/e2e/update-button.e2e.js
@@ -9,7 +9,7 @@ import { render } from "@testing-library/react";
 import * as React from "react";
 import { useMemoCacheStub } from "../test-utils/useMemoCacheStub";
 
-React.useMemoCache = useMemoCacheStub;
+React.unstable_useMemoCache = useMemoCacheStub;
 
 function Button({ label }) {
   const theme = useTheme();
diff --git a/compiler/forget/src/__tests__/fixtures/hir/call.expect.md b/compiler/forget/src/__tests__/fixtures/hir/call.expect.md
index 7c236f2afe..05808f35db 100644
--- a/compiler/forget/src/__tests__/fixtures/hir/call.expect.md
+++ b/compiler/forget/src/__tests__/fixtures/hir/call.expect.md
@@ -53,7 +53,6 @@ function Component$0(props$1) {
   const b$3 = {};
   foo$4(a$2, b$3);
   let _$5 = <div a={a$2}></div>;
-
   foo$4(b$3);
   return <div a={a$2} b={b$3}></div>;
 }
diff --git a/compiler/forget/src/__tests__/fixtures/hir/conditional-break.expect.md b/compiler/forget/src/__tests__/fixtures/hir/conditional-break.expect.md
index 6c27c54b52..703b59f405 100644
--- a/compiler/forget/src/__tests__/fixtures/hir/conditional-break.expect.md
+++ b/compiler/forget/src/__tests__/fixtures/hir/conditional-break.expect.md
@@ -98,7 +98,6 @@ function Component$0(props$1) {
   if (props$1.b) {
     return null;
   }
-
   a_DEBUG$2.push(props$1.d);
   return a_DEBUG$2;
 }
@@ -129,7 +128,6 @@ function Component$0(props$1) {
     a$2.push(props$1.c);
     ("<<TODO: handle complex control flow in codegen>>");
   }
-
   a$2.push(props$1.d);
   return a$2;
 }
@@ -161,7 +159,6 @@ function Component$0(props$1) {
     a$2.push(props$1.c);
     return null;
   }
-
   a$2.push(props$1.d);
   return a$2;
 }
@@ -192,7 +189,6 @@ function Component$0(props$1) {
     a$2.push(props$1.c);
     return a$2;
   }
-
   a$2.push(props$1.d);
   return a$2;
 }
@@ -223,7 +219,6 @@ function Component$0(props$1) {
     a$2.push(props$1.d);
     return a$2;
   }
-
   a$2.push(props$1.c);
   ("<<TODO: handle complex control flow in codegen>>");
 }
diff --git a/compiler/forget/src/__tests__/fixtures/hir/conditional-on-mutable.expect.md b/compiler/forget/src/__tests__/fixtures/hir/conditional-on-mutable.expect.md
index 7d95dfd50c..2cc637df05 100644
--- a/compiler/forget/src/__tests__/fixtures/hir/conditional-on-mutable.expect.md
+++ b/compiler/forget/src/__tests__/fixtures/hir/conditional-on-mutable.expect.md
@@ -93,12 +93,10 @@ function Component$0(props$1) {
     a$2.push(props$1.p0);
     ("<<TODO: handle complex control flow in codegen>>");
   }
-
   if (props$1.p1) {
     b$3.push(props$1.p2);
     ("<<TODO: handle complex control flow in codegen>>");
   }
-
   return <Foo$4 a={a$2} b={b$3}></Foo$4>;
 }
 
@@ -134,12 +132,10 @@ function Component$0(props$1) {
     a$2.push(props$1.p0);
     ("<<TODO: handle complex control flow in codegen>>");
   }
-
   if (props$1.p1) {
     b$3.push(props$1.p2);
     ("<<TODO: handle complex control flow in codegen>>");
   }
-
   return <Foo$6 a={a$2} b={b$3}></Foo$6>;
 }
 
diff --git a/compiler/forget/src/__tests__/fixtures/hir/constructor.expect.md b/compiler/forget/src/__tests__/fixtures/hir/constructor.expect.md
index 0aa2ea7015..045650a9ef 100644
--- a/compiler/forget/src/__tests__/fixtures/hir/constructor.expect.md
+++ b/compiler/forget/src/__tests__/fixtures/hir/constructor.expect.md
@@ -53,7 +53,6 @@ function Component$0(props$1) {
   const b$3 = {};
   new Foo$4(a$2, b$3);
   let _$5 = <div a={a$2}></div>;
-
   new Foo$4(b$3);
   return <div a={a$2} b={b$3}></div>;
 }
diff --git a/compiler/forget/src/__tests__/fixtures/hir/independent-across-if.expect.md b/compiler/forget/src/__tests__/fixtures/hir/independent-across-if.expect.md
index a0828e3d84..ffb2213e6c 100644
--- a/compiler/forget/src/__tests__/fixtures/hir/independent-across-if.expect.md
+++ b/compiler/forget/src/__tests__/fixtures/hir/independent-across-if.expect.md
@@ -120,7 +120,6 @@ function Component$0(props$1) {
     mutate$5(b$4);
     ("<<TODO: handle complex control flow in codegen>>");
   }
-
   return <Foo$6 a={a$2} b={b$4}></Foo$6>;
 }
 
diff --git a/compiler/forget/src/__tests__/fixtures/hir/interdependent-across-if.expect.md b/compiler/forget/src/__tests__/fixtures/hir/interdependent-across-if.expect.md
index 4528ebedc8..b5d8dc4883 100644
--- a/compiler/forget/src/__tests__/fixtures/hir/interdependent-across-if.expect.md
+++ b/compiler/forget/src/__tests__/fixtures/hir/interdependent-across-if.expect.md
@@ -97,7 +97,6 @@ function Component$0(props$1) {
     foo$5(a$2, b$4);
     ("<<TODO: handle complex control flow in codegen>>");
   }
-
   return <Foo$6 a={a$2} b={b$4}></Foo$6>;
 }
 
diff --git a/compiler/forget/src/__tests__/fixtures/hir/reassignment-conditional.expect.md b/compiler/forget/src/__tests__/fixtures/hir/reassignment-conditional.expect.md
index 1d15cafa2d..57cd445f04 100644
--- a/compiler/forget/src/__tests__/fixtures/hir/reassignment-conditional.expect.md
+++ b/compiler/forget/src/__tests__/fixtures/hir/reassignment-conditional.expect.md
@@ -48,9 +48,7 @@ function Component$0(props$1) {
     x$2 = [];
     ("<<TODO: handle complex control flow in codegen>>");
   }
-
   let _$4 = <Component$0 x={x$2}></Component$0>;
-
   y$3.push(props$1.p2);
   return <Component$0 x={x$2} y={y$3}></Component$0>;
 }
diff --git a/compiler/forget/src/__tests__/fixtures/hir/reassignment.expect.md b/compiler/forget/src/__tests__/fixtures/hir/reassignment.expect.md
index 044f294372..dcdd0301dd 100644
--- a/compiler/forget/src/__tests__/fixtures/hir/reassignment.expect.md
+++ b/compiler/forget/src/__tests__/fixtures/hir/reassignment.expect.md
@@ -40,7 +40,6 @@ function Component$0(props$1) {
   let y$3 = x$2;
   x$2 = [];
   let _$4 = <Component$0 x={x$2}></Component$0>;
-
   y$3.push(props$1.p1);
   return <Component$0 x={x$2} y={y$3}></Component$0>;
 }
diff --git a/compiler/forget/src/__tests__/fixtures/hir/switch-non-final-default.expect.md b/compiler/forget/src/__tests__/fixtures/hir/switch-non-final-default.expect.md
index a301daf79e..d02e9e8166 100644
--- a/compiler/forget/src/__tests__/fixtures/hir/switch-non-final-default.expect.md
+++ b/compiler/forget/src/__tests__/fixtures/hir/switch-non-final-default.expect.md
@@ -65,22 +65,18 @@ function Component$0(props$1) {
   switch (props$1.p0) {
     case 1:
       break;
-
     case true: {
       x$2.push(props$1.p2);
       y$3 = [];
       ("<<TODO: handle complex control flow in codegen>>");
     }
-
     default:
       break;
-
     case false: {
       y$3 = x$2;
       ("<<TODO: handle complex control flow in codegen>>");
     }
   }
-
   const child$7 = <Component$0 data={x$2}></Component$0>;
   y$3.push(props$1.p4);
   return <Component$0 data={y$3}>{child$7}</Component$0>;
diff --git a/compiler/forget/src/__tests__/fixtures/hir/switch.expect.md b/compiler/forget/src/__tests__/fixtures/hir/switch.expect.md
index e10639f01a..f267daf383 100644
--- a/compiler/forget/src/__tests__/fixtures/hir/switch.expect.md
+++ b/compiler/forget/src/__tests__/fixtures/hir/switch.expect.md
@@ -64,13 +64,11 @@ function Component$0(props$1) {
       y$3 = [];
       ("<<TODO: handle complex control flow in codegen>>");
     }
-
     case false: {
       y$3 = x$2;
       ("<<TODO: handle complex control flow in codegen>>");
     }
   }
-
   const child$6 = <Component$0 data={x$2}></Component$0>;
   y$3.push(props$1.p4);
   return <Component$0 data={y$3}>{child$6}</Component$0>;