diff --git a/nexosim/src/simulation.rs b/nexosim/src/simulation.rs
index b93f287..cae82bf 100644
--- a/nexosim/src/simulation.rs
+++ b/nexosim/src/simulation.rs
@@ -572,6 +572,7 @@ pub struct DeadlockInfo {
 }
 
 /// An error returned upon simulation execution failure.
+#[non_exhaustive]
 #[derive(Debug)]
 pub enum ExecutionError {
     /// The simulation has been intentionally stopped.