diff --git a/crates/sparrow-io/src/in_memory/source.rs b/crates/sparrow-io/src/in_memory/source.rs
index 1dc253de..250fbe0f 100644
--- a/crates/sparrow-io/src/in_memory/source.rs
+++ b/crates/sparrow-io/src/in_memory/source.rs
@@ -212,6 +212,7 @@ impl InMemoryBatches {
                 }
             }
         }
+        .boxed()
     }
 
     /// Retrieve the current in-memory batch.