diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3dc01b5925e..1c5aca027b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -642,6 +642,10 @@ if(NOT MSVC)
   if(HAS_WERROR_FORMAT)
     string(APPEND CMAKE_CXX_FLAGS " -Werror=format")
   endif()
+  check_cxx_compiler_flag("-Werror=cast-function-type" HAS_WERROR_CAST_FUNCTION_TYPE)
+  if(HAS_WERROR_CAST_FUNCTION_TYPE)
+    string(APPEND CMAKE_CXX_FLAGS " -Werror=cast-function-type")
+  endif()
 endif()
 
 if(USE_ASAN)
diff --git a/torch/csrc/autograd/python_variable.cpp b/torch/csrc/autograd/python_variable.cpp
index 0ff8938664f..d370f81f6c7 100644
--- a/torch/csrc/autograd/python_variable.cpp
+++ b/torch/csrc/autograd/python_variable.cpp
@@ -425,7 +425,7 @@ PyObject *THPVariable_get_names(PyObject *self, void *unused)
   END_HANDLE_TH_ERRORS
 }
 
-int THPVariable_set_names(PyObject *self, PyObject *names) {
+int THPVariable_set_names(PyObject *self, PyObject *names, void *unused) {
   HANDLE_TH_ERRORS
   if (check_has_torch_function(self)) {
     return handle_torch_function_setter((THPVariable*)self, "names", names);