diff -Naur Python-3.7.0-orig/Include/fileobject.h Python-3.7.0/Include/fileobject.h
--- Python-3.7.0-orig/Include/fileobject.h	2018-06-27 06:07:35.000000000 +0300
+++ Python-3.7.0/Include/fileobject.h	2018-07-12 10:23:01.321329200 +0300
@@ -42,7 +42,7 @@
 #endif /* Py_LIMITED_API */
 
 /* A routine to check if a file descriptor can be select()-ed. */
-#ifdef _MSC_VER
+#ifdef MS_WINDOWS
     /* On Windows, any socket fd can be select()-ed, no matter how high */
     #define _PyIsSelectable_fd(FD) (1)
 #else