diff --git a/pageserver/src/tenant/storage_layer/delta_layer.rs b/pageserver/src/tenant/storage_layer/delta_layer.rs
index d9df346a14..12733810b2 100644
--- a/pageserver/src/tenant/storage_layer/delta_layer.rs
+++ b/pageserver/src/tenant/storage_layer/delta_layer.rs
@@ -632,11 +632,11 @@ impl DeltaLayerWriterInner {
     ///
     /// The values must be appended in key, lsn order.
     ///
-    fn put_value(&mut self, key: Key, lsn: Lsn, val: Value) -> anyhow::Result<()> {
-        self.put_value_bytes(key, lsn, &Value::ser(&val)?, val.will_init())
+    async fn put_value(&mut self, key: Key, lsn: Lsn, val: Value) -> anyhow::Result<()> {
+        self.put_value_bytes(key, lsn, &Value::ser(&val)?, val.will_init()).await
     }
 
-    fn put_value_bytes(
+    async fn put_value_bytes(
         &mut self,
         key: Key,
         lsn: Lsn,
@@ -645,7 +645,7 @@ impl DeltaLayerWriterInner {
     ) -> anyhow::Result<()> {
         assert!(self.lsn_range.start <= lsn);
 
-        let off = self.blob_writer.write_blob(val)?;
+        let off = self.blob_writer.write_blob(val)?; // TOOD: do what we discussed
 
         let blob_ref = BlobRef::new(off, will_init);
 
@@ -797,11 +797,11 @@ impl DeltaLayerWriter {
     ///
     /// The values must be appended in key, lsn order.
     ///
-    pub fn put_value(&mut self, key: Key, lsn: Lsn, val: Value) -> anyhow::Result<()> {
-        self.inner.as_mut().unwrap().put_value(key, lsn, val)
+    pub async fn put_value(&mut self, key: Key, lsn: Lsn, val: Value) -> anyhow::Result<()> {
+        self.inner.as_mut().unwrap().put_value(key, lsn, val).await
     }
 
-    pub fn put_value_bytes(
+    pub async fn put_value_bytes(
         &mut self,
         key: Key,
         lsn: Lsn,
@@ -811,7 +811,7 @@ impl DeltaLayerWriter {
         self.inner
             .as_mut()
             .unwrap()
-            .put_value_bytes(key, lsn, val, will_init)
+            .put_value_bytes(key, lsn, val, will_init).await
     }
 
     pub fn size(&self) -> u64 {
diff --git a/pageserver/src/tenant/storage_layer/inmemory_layer.rs b/pageserver/src/tenant/storage_layer/inmemory_layer.rs
index 35a77a7331..e954f89694 100644
--- a/pageserver/src/tenant/storage_layer/inmemory_layer.rs
+++ b/pageserver/src/tenant/storage_layer/inmemory_layer.rs
@@ -348,7 +348,7 @@ impl InMemoryLayer {
             for (lsn, pos) in vec_map.as_slice() {
                 cursor.read_blob_into_buf(*pos, &mut buf).await?;
                 let will_init = Value::des(&buf)?.will_init();
-                delta_layer_writer.put_value_bytes(key, *lsn, &buf, will_init)?;
+                delta_layer_writer.put_value_bytes(key, *lsn, &buf, will_init).await?;
             }
         }
 
diff --git a/pageserver/src/tenant/timeline.rs b/pageserver/src/tenant/timeline.rs
index 04da85a241..952ea23f51 100644
--- a/pageserver/src/tenant/timeline.rs
+++ b/pageserver/src/tenant/timeline.rs
@@ -3599,7 +3599,7 @@ impl Timeline {
                 )))
             });
 
-            writer.as_mut().unwrap().put_value(key, lsn, value)?;
+            writer.as_mut().unwrap().put_value(key, lsn, value).await?;
             prev_key = Some(key);
         }
         if let Some(writer) = writer {