diff --git a/vortex-serde/src/layouts/write/writer.rs b/vortex-serde/src/layouts/write/writer.rs
index 686879ef60..43382ad9bb 100644
--- a/vortex-serde/src/layouts/write/writer.rs
+++ b/vortex-serde/src/layouts/write/writer.rs
@@ -105,7 +105,7 @@ impl<W: VortexWrite> LayoutWriter<W> {
             Some(x) => x,
         };
 
-        let mut byte_offsets = Vec::with_capacity(size_hint);
+        let mut byte_offsets = Vec::with_capacity(size_hint + 1);
         byte_offsets.push(self.msgs.tell());
         while let Some(chunk) = stream.try_next().await? {
             metadata.push_chunk(&chunk)?;