diff --git a/relay-server/src/envelope/attachment.rs b/relay-server/src/envelope/attachment.rs
index 22c9614f2e..6ab2f01ae8 100644
--- a/relay-server/src/envelope/attachment.rs
+++ b/relay-server/src/envelope/attachment.rs
@@ -77,7 +77,7 @@ impl fmt::Display for AttachmentType {
 
 /// Represents the payload of an [attachment placeholder item](
 /// https://develop.sentry.dev/sdk/telemetry/attachments/#attachment-placeholder-item).
-#[cfg_attr(not(sentry), expect(unused))]
+#[cfg_attr(all(not(sentry), not(feature = "processing")), expect(unused))]
 #[derive(Serialize, Deserialize)]
 pub struct AttachmentPlaceholder<'a> {
     #[serde(borrow)]