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-rw-r--r--Modules/_posixsubprocess.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/Modules/_posixsubprocess.c b/Modules/_posixsubprocess.c
index bf10cbb..af0d971 100644
--- a/Modules/_posixsubprocess.c
+++ b/Modules/_posixsubprocess.c
@@ -1,7 +1,7 @@
/* Authors: Gregory P. Smith & Jeffrey Yasskin */
#include "Python.h"
-#ifdef HAVE_PIPE2
-#define _GNU_SOURCE
+#if defined(HAVE_PIPE2) && !defined(_GNU_SOURCE)
+# define _GNU_SOURCE
#endif
#include <unistd.h>
#include <fcntl.h>