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-rw-r--r--Modules/_multiprocessing/multiprocessing.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/Modules/_multiprocessing/multiprocessing.h b/Modules/_multiprocessing/multiprocessing.h
index b595e5a8dd..dfc2a8e079 100644
--- a/Modules/_multiprocessing/multiprocessing.h
+++ b/Modules/_multiprocessing/multiprocessing.h
@@ -12,7 +12,9 @@
*/
#ifdef MS_WINDOWS
-# define WIN32_LEAN_AND_MEAN
+# ifndef WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+# endif
# include <windows.h>
# include <winsock2.h>
# include <process.h> /* getpid() */