diff --git a/src/runtime/setup.rs b/src/runtime/setup.rs
index e17a14087898ccb8efc6d03946a66a7428e30a6b..76092a343447c3472b145338036282ce5b169f48 100644
--- a/src/runtime/setup.rs
+++ b/src/runtime/setup.rs
@@ -127,7 +127,12 @@ impl Controller {
             round_index: 0,
             logger,
         };
-        let controller = Self { protocol_description, inner, ephemeral: Default::default() };
+        let controller = Self {
+            protocol_description,
+            inner,
+            ephemeral: Default::default(),
+            round_histories: vec![],
+        };
         Ok((controller, native_interface))
     }