diff --git a/LibCarla/source/carla/client/Client.h b/LibCarla/source/carla/client/Client.h
index fdea119c8..2d2b3d0a0 100644
--- a/LibCarla/source/carla/client/Client.h
+++ b/LibCarla/source/carla/client/Client.h
@@ -43,11 +43,11 @@ namespace client {
       return _simulator->GetServerVersion();
     }
 
-    World ReloadWorld() {
+    World ReloadWorld() const {
       return World{_simulator->ReloadEpisode()};
     }
 
-    World LoadWorld(std::string map_name) {
+    World LoadWorld(std::string map_name) const {
       return World{_simulator->LoadEpisode(std::move(map_name))};
     }
 
diff --git a/PythonAPI/source/libcarla/Client.cpp b/PythonAPI/source/libcarla/Client.cpp
index ecd1d3ad6..a4c085953 100644
--- a/PythonAPI/source/libcarla/Client.cpp
+++ b/PythonAPI/source/libcarla/Client.cpp
@@ -22,8 +22,8 @@ void export_client() {
     .def("get_client_version", &cc::Client::GetClientVersion)
     .def("get_server_version", CONST_CALL_WITHOUT_GIL(cc::Client, GetServerVersion))
     .def("get_world", &cc::Client::GetWorld)
-    .def("reload_world", CALL_WITHOUT_GIL(cc::Client, ReloadWorld))
-    .def("load_world", CALL_WITHOUT_GIL_1(cc::Client, LoadWorld, std::string), (arg("map_name")))
+    .def("reload_world", CONST_CALL_WITHOUT_GIL(cc::Client, ReloadWorld))
+    .def("load_world", CONST_CALL_WITHOUT_GIL_1(cc::Client, LoadWorld, std::string), (arg("map_name")))
     .def("start_recorder", CALL_WITHOUT_GIL_1(cc::Client, StartRecorder, std::string), (arg("name")))
     .def("stop_recorder", &cc::Client::StopRecorder)
     .def("show_recorder_file_info", CALL_WITHOUT_GIL_1(cc::Client, ShowRecorderFileInfo, std::string), (arg("name")))
diff --git a/PythonAPI/source/libcarla/libcarla.cpp b/PythonAPI/source/libcarla/libcarla.cpp
index d5f1f35e9..c6faddc22 100644
--- a/PythonAPI/source/libcarla/libcarla.cpp
+++ b/PythonAPI/source/libcarla/libcarla.cpp
@@ -44,6 +44,7 @@
 
 // Convenient for const requests without arguments.
 #define CONST_CALL_WITHOUT_GIL(cls, fn) CALL_WITHOUT_GIL(const cls, fn)
+#define CONST_CALL_WITHOUT_GIL_1(cls, fn, T1_) CALL_WITHOUT_GIL_1(const cls, fn, T1_)
 
 // Convenient for const requests that need to make a copy of the returned value.
 #define CALL_RETURNING_COPY(cls, fn) +[](const cls &self) \