diff --git a/PC/_subprocess.c b/PC/_subprocess.c
index 8ed4899..b675b88 100644
--- a/PC/_subprocess.c
+++ b/PC/_subprocess.c
@@ -553,6 +553,8 @@
 	sp_handle_as_number.nb_int = (unaryfunc) sp_handle_as_int;
 
 	m = Py_InitModule("_subprocess", sp_functions);
+	if (m == NULL)
+		return;
 	d = PyModule_GetDict(m);
 
 	/* constants */
diff --git a/PC/_winreg.c b/PC/_winreg.c
index 34e4f68..965acf1 100644
--- a/PC/_winreg.c
+++ b/PC/_winreg.c
@@ -1459,6 +1459,8 @@
 {
 	PyObject *m, *d;
 	m = Py_InitModule3("_winreg", winreg_methods, module_doc);
+	if (m == NULL)
+		return;
 	d = PyModule_GetDict(m);
 	PyHKEY_Type.ob_type = &PyType_Type;
 	PyHKEY_Type.tp_doc = PyHKEY_doc;
diff --git a/PC/msvcrtmodule.c b/PC/msvcrtmodule.c
index 84cf0c1..4453023 100755
--- a/PC/msvcrtmodule.c
+++ b/PC/msvcrtmodule.c
@@ -221,6 +221,8 @@
 initmsvcrt(void)
 {
 	PyObject *m = Py_InitModule("msvcrt", msvcrt_functions);
+	if (m == NULL)
+		return;
 	PyObject *d = PyModule_GetDict(m);
 
 	/* constants for the locking() function's mode argument */
diff --git a/PC/winsound.c b/PC/winsound.c
index b94b322..81e3917 100644
--- a/PC/winsound.c
+++ b/PC/winsound.c
@@ -220,6 +220,8 @@
 	PyObject *module = Py_InitModule3("winsound",
 					  sound_methods,
 					  sound_module_doc);
+	if (module == NULL)
+		return;
 	PyObject *dict = PyModule_GetDict(module);
 
 	ADD_DEFINE(SND_ASYNC);