diff --git a/codex-rs/core/src/tasks/review.rs b/codex-rs/core/src/tasks/review.rs
index daa394df91..111ff085ca 100644
--- a/codex-rs/core/src/tasks/review.rs
+++ b/codex-rs/core/src/tasks/review.rs
@@ -91,15 +91,7 @@ async fn start_review_conversation(
         .web_search_mode
         .set(WebSearchMode::Disabled)
     {
-        tracing::warn!(
-            "failed to force review web_search_mode=disabled; falling back to a normalizer: {err}"
-        );
-        sub_agent_config.web_search_mode =
-            Constrained::normalized(WebSearchMode::Disabled, |_| WebSearchMode::Disabled)
-                .unwrap_or_else(|err| {
-                    tracing::warn!("failed to build normalizer for review web_search_mode: {err}");
-                    Constrained::allow_any(WebSearchMode::Disabled)
-                });
+        panic!("by construction Constrained<WebSearchMode> must always support Disabled: {err}");
     }
 
     // Set explicit review rubric for the sub-agent