diff --git a/src/protocol/mod.rs b/src/protocol/mod.rs
index b8adde87457e2c714fc6cefea8019eab0093d3ee..b07b410ed8904d46c4b368c3901aebedaa340698 100644
--- a/src/protocol/mod.rs
+++ b/src/protocol/mod.rs
@@ -12,6 +12,7 @@ use crate::protocol::eval::*;
 use crate::protocol::inputsource::*;
 use crate::protocol::parser::*;
 
+#[derive(serde::Serialize)]
 pub struct ProtocolDescriptionImpl {
     heap: Heap,
     source: InputSource,