diff --git a/crates/lune/src/rt/runtime.rs b/crates/lune/src/rt/runtime.rs
index 7c45355..cf2f0fc 100644
--- a/crates/lune/src/rt/runtime.rs
+++ b/crates/lune/src/rt/runtime.rs
@@ -14,6 +14,7 @@ use super::{RuntimeError, RuntimeResult};
 /**
     Values returned by running a Lune runtime until completion.
 */
+#[derive(Debug)]
 #[non_exhaustive]
 pub struct RuntimeReturnValues {
     /// The exit code manually returned from the runtime, if any.