diff --git a/pageserver/src/tenant/storage_layer/delta_layer.rs b/pageserver/src/tenant/storage_layer/delta_layer.rs
index b0477fc308..3b059169de 100644
--- a/pageserver/src/tenant/storage_layer/delta_layer.rs
+++ b/pageserver/src/tenant/storage_layer/delta_layer.rs
@@ -117,6 +117,8 @@ impl From<&DeltaLayer> for Summary {
 impl Summary {
     /// Serializes the summary header into an aligned buffer of lenth `PAGE_SZ`.
     pub fn ser_into_page(&self) -> Result<IoBuffer, SerializeError> {
+        let mut buf = bytes::BytesMut::with_capacity(PAGE_SZ);
+        Self::ser_into(&self, &mut buf);
         let mut buf = IoBufferMut::with_capacity(PAGE_SZ);
         Self::ser_into(&self, &mut buf)?;
         // Pad zeroes to the buffer so the length is a multiple of the alignment.
diff --git a/pageserver/src/tenant/storage_layer/image_layer.rs b/pageserver/src/tenant/storage_layer/image_layer.rs
index 932cf20745..2db55c80a3 100644
--- a/pageserver/src/tenant/storage_layer/image_layer.rs
+++ b/pageserver/src/tenant/storage_layer/image_layer.rs
@@ -887,9 +887,11 @@ impl ImageLayerWriterInner {
         let file = self.blob_writer.into_inner(ctx).await?;
 
         // Write out the index
-        // TODO(yuchen): should we just replace BlockBuf::blocks with one big buffer?
         let mut offset = index_start_blk as u64 * PAGE_SZ as u64;
         let (index_root_blk, block_buf) = self.tree.finish()?;
+
+        // TODO(yuchen): https://github.com/neondatabase/neon/issues/10092
+        // Should we just replace BlockBuf::blocks with one big buffer?
         for buf in block_buf.blocks {
             let (_buf, res) = file.write_all_at(buf.slice_len(), offset, ctx).await;
             res?;