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-rw-r--r--implement.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/implement.h b/implement.h
index c4d0a52..937a0cb 100644
--- a/implement.h
+++ b/implement.h
@@ -38,7 +38,9 @@
#if !defined(_IMPLEMENT_H)
#define _IMPLEMENT_H
+#if !defined(_WIN32_WINNT)
#define _WIN32_WINNT 0x400
+#endif
#include <windows.h>