--- generic-msvc.h.orig	2017-10-14 07:05:40.172907200 +0900
+++ generic-msvc.h	2017-10-14 07:12:40.786820600 +0900
@@ -82,7 +82,7 @@
 {
 	bool	ret;
 	uint64	current;
-	current = _InterlockedCompareExchange64(&ptr->value, newval, *expected);
+	current = _InterlockedCompareExchange64((int64*)&ptr->value, newval, *expected);
 	ret = current == *expected;
 	*expected = current;
 	return ret;
@@ -96,7 +96,7 @@
 static inline uint64
 pg_atomic_fetch_add_u64_impl(volatile pg_atomic_uint64 *ptr, int64 add_)
 {
-	return _InterlockedExchangeAdd64(&ptr->value, add_);
+	return _InterlockedExchangeAdd64((int64*)&ptr->value, add_);
 }
 #endif /* _WIN64 */