diff --git a/tests/baselines/reference/mappedTypeErrors.errors.txt b/tests/baselines/reference/mappedTypeErrors.errors.txt
index 724ab902fc3..4efcc579ba8 100644
--- a/tests/baselines/reference/mappedTypeErrors.errors.txt
+++ b/tests/baselines/reference/mappedTypeErrors.errors.txt
@@ -79,7 +79,7 @@ tests/cases/conformance/types/mapped/mappedTypeErrors.ts(51,24): error TS2344: T
 !!! error TS2344: Type '"x" | "y"' does not satisfy the constraint '"name" | "width" | "height" | "visible"'.
 !!! error TS2344:   Type '"x"' is not assignable to type '"name" | "width" | "height" | "visible"'.
     type T15 = Pick<Shape, never>;
-    type T16 = Pick<Shape, undefined>;
+    type T16 = Pick<Shape, undefined>;  // Error
                            ~~~~~~~~~
 !!! error TS2344: Type 'undefined' does not satisfy the constraint '"name" | "width" | "height" | "visible"'.
     
diff --git a/tests/baselines/reference/mappedTypeErrors.js b/tests/baselines/reference/mappedTypeErrors.js
index f717f0d02f3..b2c8dc2e84a 100644
--- a/tests/baselines/reference/mappedTypeErrors.js
+++ b/tests/baselines/reference/mappedTypeErrors.js
@@ -42,7 +42,7 @@ type T12 = Pick<Shape, "name" | "foo">;  // Error
 type T13 = Pick<Shape, keyof Named>;
 type T14 = Pick<Shape, keyof Point>;  // Error
 type T15 = Pick<Shape, never>;
-type T16 = Pick<Shape, undefined>;
+type T16 = Pick<Shape, undefined>;  // Error
 
 function f1<T>(x: T) {
     let y: Pick<Shape, T>;  // Error