diff --git a/tests/baselines/reference/declFileConstructors.js b/tests/baselines/reference/declFileConstructors.js
index 44e816712fb..8e92b1a36ae 100644
--- a/tests/baselines/reference/declFileConstructors.js
+++ b/tests/baselines/reference/declFileConstructors.js
@@ -247,7 +247,7 @@ export declare class ConstructorWithPrivateParameterProperty {
     constructor(x: string);
 }
 export declare class ConstructorWithOptionalParameterProperty {
-    x: string;
+    x?: string;
     constructor(x?: string);
 }
 export declare class ConstructorWithParameterInitializer {
@@ -281,7 +281,7 @@ declare class GlobalConstructorWithPrivateParameterProperty {
     constructor(x: string);
 }
 declare class GlobalConstructorWithOptionalParameterProperty {
-    x: string;
+    x?: string;
     constructor(x?: string);
 }
 declare class GlobalConstructorWithParameterInitializer {