-*- Mode:Diff -*-
--- python3/PC/pyconfig.h
+++ python3/PC/pyconfig.h
@@ -602,6 +602,10 @@
 /* Define if you have readlink.  */
 /* #undef HAVE_READLINK */
 
+#if defined(_MSC_VER) && _MSC_VER >= 1800
+#define HAVE_ROUND
+#endif
+
 /* Define if you have select.  */
 /* #undef HAVE_SELECT */
 
