diff --git a/core/src/serialize.rs b/core/src/serialize.rs
index ee1478582d..16eafe0272 100644
--- a/core/src/serialize.rs
+++ b/core/src/serialize.rs
@@ -47,6 +47,8 @@ impl fmt::Display for ExportFormat {
     }
 }
 
+// TODO: This type is publicly exposed, but never constructed.
+#[allow(dead_code)]
 #[derive(Clone, Eq, PartialEq, Debug)]
 pub struct ParseFormatError(String);