diff --git a/concrete-optimizer/src/utils/cache/persistent.rs b/concrete-optimizer/src/utils/cache/persistent.rs
index e95c90b72..b5dc95faf 100644
--- a/concrete-optimizer/src/utils/cache/persistent.rs
+++ b/concrete-optimizer/src/utils/cache/persistent.rs
@@ -71,7 +71,7 @@ where
             content,
             content_changed,
             version,
-            function: Arc::new(Box::new(function)),
+            function: Arc::new(function),
         }
     }