diff --git a/src/cst.ts b/src/cst.ts
index 7f614a805..9f49302f1 100644
--- a/src/cst.ts
+++ b/src/cst.ts
@@ -1128,7 +1128,7 @@ export class ReturnStatement extends SyntaxBase {
 
   public constructor(
     public returnKeyword: ReturnKeyword,
-    public expression: Expression
+    public expression: Expression | null
   ) {
     super();
   }