diff --git a/codex-rs/core/src/event_mapping_tests.rs b/codex-rs/core/src/event_mapping_tests.rs
index 5c77991d97..befd9463bd 100644
--- a/codex-rs/core/src/event_mapping_tests.rs
+++ b/codex-rs/core/src/event_mapping_tests.rs
@@ -259,6 +259,7 @@ fn parses_hook_prompt_and_hides_other_contextual_fragments() {
                         .to_string(),
             },
         ],
+        metadata: None,
         end_turn: None,
         phase: None,
     };