diff --git a/src/win.h b/src/win.h
index 9abd59d..b6b1329 100644
--- a/src/win.h
+++ b/src/win.h
@@ -5,6 +5,14 @@
 #define WIN32_LEAN_AND_MEAN
 #endif
 
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0600
+#undef _WIN32_WINNT
+#endif
+
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT 0x0600
+#endif
+
 #pragma warning(push, 1)
 
 #include <windows.h>