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-rw-r--r--src/osd/windows/winprefix.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/osd/windows/winprefix.h b/src/osd/windows/winprefix.h
index 576c7013412..2635685eff1 100644
--- a/src/osd/windows/winprefix.h
+++ b/src/osd/windows/winprefix.h
@@ -6,7 +6,9 @@
//
//============================================================
+#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0501 // Windows XP
+#endif
#ifdef _MSC_VER
#include <assert.h>