diff --git a/codex-rs/core/src/session/tests.rs b/codex-rs/core/src/session/tests.rs
index 4b847295ba..dfca14d553 100644
--- a/codex-rs/core/src/session/tests.rs
+++ b/codex-rs/core/src/session/tests.rs
@@ -7772,6 +7772,14 @@ async fn pending_request_user_input_does_not_spawn_extra_goal_continuation() ->
             .features
             .enable(Feature::DefaultModeRequestUserInput)
             .expect("default-mode request_user_input should be enableable in tests");
+        if !config
+            .request_user_input_allowed_modes
+            .contains(&ModeKind::Default)
+        {
+            config
+                .request_user_input_allowed_modes
+                .push(ModeKind::Default);
+        }
     });
     let test = builder.build(&server).await?;
     let responses = mount_sse_sequence(
diff --git a/codex-rs/core/tests/suite/request_user_input.rs b/codex-rs/core/tests/suite/request_user_input.rs
index 6ddd9d0b5e..315eba9e98 100644
--- a/codex-rs/core/tests/suite/request_user_input.rs
+++ b/codex-rs/core/tests/suite/request_user_input.rs
@@ -96,6 +96,14 @@ async fn request_user_input_round_trip_for_mode(mode: ModeKind) -> anyhow::Resul
                     .features
                     .enable(Feature::DefaultModeRequestUserInput)
                     .expect("test config should allow feature update");
+                if !config
+                    .request_user_input_allowed_modes
+                    .contains(&ModeKind::Default)
+                {
+                    config
+                        .request_user_input_allowed_modes
+                        .push(ModeKind::Default);
+                }
             }
         })
         .build(&server)