diff --git a/src/common/compat.h b/src/common/compat.h
index 43199d9302..6116264d79 100644
--- a/src/common/compat.h
+++ b/src/common/compat.h
@@ -89,7 +89,7 @@ size_t strlcat(char *dst, const char *src, size_t siz);
 size_t strlcpy(char *dst, const char *src, size_t siz);
 #endif
 
-#ifdef MS_WINDOWS
+#ifdef _MSC_VER
 #define U64_PRINTF_ARG(a) (a)
 #define U64_SCANF_ARG(a) (a)
 #define U64_FORMAT "%I64u"
diff --git a/src/common/torgzip.c b/src/common/torgzip.c
index 12cc7ec969..3542a48828 100644
--- a/src/common/torgzip.c
+++ b/src/common/torgzip.c
@@ -15,7 +15,7 @@ const char torgzip_c_id[] =
 #include <stdlib.h>
 #include <stdio.h>
 #include <assert.h>
-#ifdef MS_WINDOWS
+#ifdef _MSC_VER
 #include "..\..\contrib\zlib\zlib.h"
 #else
 #include <zlib.h>