diff --git a/minitar.h b/minitar.h
index b89e4d8..3ddf49f 100644
--- a/minitar.h
+++ b/minitar.h
@@ -12,7 +12,7 @@
 #include <stdio.h>
 #include <time.h>
 
-#ifdef _MSC_VER
+#ifdef _WIN32
 typedef unsigned int mode_t;
 typedef unsigned int gid_t;
 typedef unsigned int uid_t;
diff --git a/src/util.c b/src/util.c
index fda30a8..08b8c31 100644
--- a/src/util.c
+++ b/src/util.c
@@ -20,7 +20,7 @@
 #define noreturn _Noreturn
 #endif
 
-#if !defined(_MSC_VER) && !defined(__TINYC__)
+#if !defined(_WIN32) && !defined(__TINYC__)
 #define WEAK __attribute__((weak))
 #else
 #define WEAK