diff --git a/lib/llm/src/block_manager/pool/managed.rs b/lib/llm/src/block_manager/pool/managed.rs
index 7152924f3e..17fc986158 100644
--- a/lib/llm/src/block_manager/pool/managed.rs
+++ b/lib/llm/src/block_manager/pool/managed.rs
@@ -77,7 +77,7 @@ pub struct ManagedBlockPoolArgs<S: Storage, L: LocalityProvider, M: BlockMetadat
     )]
     pool_metrics: Arc<PoolMetrics>,
 
-    #[builder(default = "BlockRegistrationDuplicationSetting::Allowed")]
+    #[builder(default = "BlockRegistrationDuplicationSetting::Disabled")]
     default_duplication_setting: BlockRegistrationDuplicationSetting,
 }