diff --git a/crates/snapbox/src/data/format.rs b/crates/snapbox/src/data/format.rs
index af4bc7dc..07e4a75d 100644
--- a/crates/snapbox/src/data/format.rs
+++ b/crates/snapbox/src/data/format.rs
@@ -1,4 +1,5 @@
 #[derive(Clone, Debug, PartialEq, Eq, Copy, Hash, Default)]
+#[non_exhaustive]
 pub enum DataFormat {
     Error,
     Binary,