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-rw-r--r--src/serialize.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/serialize.h b/src/serialize.h
index 6eb4f4ee41..c046bf37ef 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -23,6 +23,7 @@ typedef long long int64;
typedef unsigned long long uint64;
#ifdef WIN32
+#define _WIN32_WINNT 0x0501
#include <windows.h>
// This is used to attempt to keep keying material out of swap
// Note that VirtualLock does not provide this as a guarantee on Windows,