diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index d98e4e5081..b8d3c7b18f 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -10,7 +10,6 @@
 import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as ExportsType from './ReactFeatureFlags.native-fb';
 
-// NOTE: There are no flags, currently. Uncomment the stuff below if we add one.
 // Re-export dynamic flags from the internal module. Intentionally using *
 // because this import is compiled to a `require` call.
 import * as dynamicFlags from 'ReactNativeInternalFeatureFlags';
@@ -86,7 +85,7 @@ export const enableTransitionTracing = false;
 
 export const enableFloat = true;
 
-export const useModernStrictMode = false;
+export const useModernStrictMode = true;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableFizzExternalRuntime = false;
 
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
index 347ff62abf..55ad418a31 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.native.js
@@ -70,7 +70,7 @@ export const enableTransitionTracing = false;
 
 export const enableFloat = true;
 
-export const useModernStrictMode = false;
+export const useModernStrictMode = true;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableDeferRootSchedulingToMicrotask = true;
 
diff --git a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
index 775dced6d1..a414c3fbe6 100644
--- a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
+++ b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
@@ -43,6 +43,8 @@ export const enableDebugTracing = __EXPERIMENTAL__;
 
 export const enableSchedulingProfiler = __VARIANT__;
 
+export const useModernStrictMode = __VARIANT__;
+
 // These are already tested in both modes using the build type dimension,
 // so we don't need to use __VARIANT__ to get extra coverage.
 export const replayFailedUnitOfWorkWithInvokeGuardedCallback = __DEV__;