diff --git a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
index a8c873d93b86e..b97a52e52a56e 100644
--- a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
+++ b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
@@ -28,6 +28,7 @@ export const alwaysThrottleRetries = __VARIANT__;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = __VARIANT__;
 export const enableUseDeferredValueInitialArg = __VARIANT__;
 export const enableRenderableContext = __VARIANT__;
+export const useModernStrictMode = __VARIANT__;
 
 export const enableRetryLaneExpiration = __VARIANT__;
 export const retryLaneExpirationMs = 5000;
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
index 2bfba8c3a858f..0a18e4300be43 100644
--- a/packages/shared/forks/ReactFeatureFlags.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.www.js
@@ -36,6 +36,7 @@ export const {
   transitionLaneExpirationMs,
   enableInfiniteRenderLoopDetection,
   enableRenderableContext,
+  useModernStrictMode,
 } = dynamicFeatureFlags;
 
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.
@@ -103,7 +104,6 @@ export const allowConcurrentByDefault = true;
 
 export const consoleManagedByDevToolsDuringStrictMode = true;
 
-export const useModernStrictMode = false;
 export const enableFizzExternalRuntime = true;
 
 export const forceConcurrentByDefaultForTesting = false;