diff --git a/finnow-api/source/transaction/service.d b/finnow-api/source/transaction/service.d
index d1ae318..280a7c3 100644
--- a/finnow-api/source/transaction/service.d
+++ b/finnow-api/source/transaction/service.d
@@ -345,7 +345,7 @@ TransactionCategoryResponse[] getChildCategories(ProfileDataSource ds, ulong cat
     import std.algorithm : map;
     import std.array : array;
     auto categories = ds.getTransactionCategoryRepository().findAllByParentId(Optional!ulong.of(categoryId));
-    return categories.map!(TransactionCategoryResponse.of).array;
+    return categories.map!(c => TransactionCategoryResponse.of(c)).array;
 }
 
 TransactionCategoryResponse createCategory(ProfileDataSource ds, in CategoryPayload payload) {