diff --git a/packages/compiler-core/src/ast.ts b/packages/compiler-core/src/ast.ts
index 3f92a99fcbb..91354b1b40b 100644
--- a/packages/compiler-core/src/ast.ts
+++ b/packages/compiler-core/src/ast.ts
@@ -571,7 +571,7 @@ export interface ForRenderListExpression extends CallExpression {
 }
 
 export interface ForIteratorExpression extends FunctionExpression {
-  returns: BlockCodegenNode
+  returns?: BlockCodegenNode
 }
 
 // AST Utilities ---------------------------------------------------------------