diff --git a/crates/ecstore/src/services/rebalance/control.rs b/crates/ecstore/src/services/rebalance/control.rs
index 97cc6fc34..98d66a5b2 100644
--- a/crates/ecstore/src/services/rebalance/control.rs
+++ b/crates/ecstore/src/services/rebalance/control.rs
@@ -41,7 +41,7 @@ fn ensure_rebalance_activation_pool_meta_allowed(meta: &PoolMeta) -> Result<()>
 }
 
 pub(super) enum RebalanceWorkerActivationFence {
-    Ready(PoolRebalanceActivationFence),
+    Ready(Box<PoolRebalanceActivationFence>),
     NotStartedTerminal,
 }
 
@@ -324,7 +324,7 @@ impl ECStore {
             return Ok(RebalanceWorkerActivationFence::NotStartedTerminal);
         }
 
-        Ok(RebalanceWorkerActivationFence::Ready(activation_fence))
+        Ok(RebalanceWorkerActivationFence::Ready(Box::new(activation_fence)))
     }
 
     #[tracing::instrument(skip_all)]
diff --git a/crates/ecstore/src/services/rebalance/rebalance_unit_tests.rs b/crates/ecstore/src/services/rebalance/rebalance_unit_tests.rs
index c82eda451..c4a67d9e8 100644
--- a/crates/ecstore/src/services/rebalance/rebalance_unit_tests.rs
+++ b/crates/ecstore/src/services/rebalance/rebalance_unit_tests.rs
@@ -2752,8 +2752,10 @@ async fn test_old_worker_cannot_mutate_replacement_rebalance_state() {
         ..Default::default()
     };
     let store = test_store_with_rebalance_meta(meta);
-    let mut fi = FileInfo::default();
-    fi.size = 128;
+    let fi = FileInfo {
+        size: 128,
+        ..Default::default()
+    };
 
     for err in [
         store