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-rw-r--r--Modules/errnomodule.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/Modules/errnomodule.c b/Modules/errnomodule.c
index 4de4144520..df4e494ba8 100644
--- a/Modules/errnomodule.c
+++ b/Modules/errnomodule.c
@@ -5,7 +5,9 @@
/* Windows socket errors (WSA*) */
#ifdef MS_WINDOWS
+#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
+#endif
#include <windows.h>
/* The following constants were added to errno.h in VS2010 but have
preferred WSA equivalents. */