diff --git a/compiler/cpp/src/thrift/generate/t_py_generator.cc b/compiler/cpp/src/thrift/generate/t_py_generator.cc
index b86f870..06bd17b 100644
--- a/compiler/cpp/src/thrift/generate/t_py_generator.cc
+++ b/compiler/cpp/src/thrift/generate/t_py_generator.cc
@@ -437,7 +437,11 @@
            << "from thrift.transport import TTransport" << '\n'
            << import_dynbase_;
 
-  f_types_ << "all_structs = []" << '\n';
+  if (gen_type_hints_) {
+    f_types_ << "all_structs: list[typing.Any] = []" << '\n';
+  } else {
+    f_types_ << "all_structs = []" << '\n';
+  }
 
   f_consts_ <<
     py_autogen_comment() << '\n' <<