diff --git a/src/posix-compat.c b/src/posix-compat.c
index e68f848..020d61f 100644
--- a/src/posix-compat.c
+++ b/src/posix-compat.c
@@ -4,6 +4,8 @@
 #ifdef VANILLA_WIN32
 # define VC_EXTRALEAN
 # define WIN32_LEAN_AND_MEAN
+# undef _WIN32_WINNT
+# define _WIN32_WINNT 0x0502
 # include <windows.h>
 # include <io.h>
 # include <fcntl.h>