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-rw-r--r--compat/poll/poll.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/compat/poll/poll.c b/compat/poll/poll.c
index 44103103a4..31163f2ae7 100644
--- a/compat/poll/poll.c
+++ b/compat/poll/poll.c
@@ -39,7 +39,7 @@
#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
# define WIN32_NATIVE
-# if defined (_MSC_VER)
+# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
# define _WIN32_WINNT 0x0502
# endif
# include <winsock2.h>