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-rw-r--r--erts/etc/unix/run_erl.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/erts/etc/unix/run_erl.c b/erts/etc/unix/run_erl.c
index a6fc4c2bf5..4b123b8911 100644
--- a/erts/etc/unix/run_erl.c
+++ b/erts/etc/unix/run_erl.c
@@ -40,9 +40,13 @@
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
+
#ifdef HAVE_WORKING_POSIX_OPENPT
+#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600
#endif
+#endif
+
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>