diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index 162b26f6920dc..3d0c70ef5f8d6 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -76,7 +76,7 @@ export const disableSchedulerTimeoutInWorkLoop = false;
 export const enableLazyContextPropagation = false;
 export const enableLegacyHidden = false;
 export const forceConcurrentByDefaultForTesting = false;
-export const allowConcurrentByDefault = true;
+export const allowConcurrentByDefault = false;
 export const enableCustomElementPropertySupport = false;
 
 export const consoleManagedByDevToolsDuringStrictMode = false;