diff --git a/src/parser/statement/for-in-statement.tsx b/src/parser/statement/for-in-statement.tsx
index bb2778d..ed2af03 100644
--- a/src/parser/statement/for-in-statement.tsx
+++ b/src/parser/statement/for-in-statement.tsx
@@ -13,7 +13,7 @@ export interface ITypeForInStatement {
 }
 
 function findProp(obj: IObjectTypeLiteral, name: string) {
-    return obj.props.find(prop => prop.kind === "TypeObjectProperty" && prop.name.name === name) as ITypeObjectProperty;
+    return obj.props.find(prop => prop.kind === "TypeObjectProperty" && prop.name.kind === "Identifier" && prop.name.name === name) as ITypeObjectProperty;
 }
 
 export function TypeForInStatement() {