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-rw-r--r--rts/PosixSource.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/rts/PosixSource.h b/rts/PosixSource.h
index a938f9bc0f..cd1aeea34c 100644
--- a/rts/PosixSource.h
+++ b/rts/PosixSource.h
@@ -11,8 +11,9 @@
#define _POSIX_SOURCE 1
#define _POSIX_C_SOURCE 199506L
-#define _ISOC9X_SOURCE
+#define _XOPEN_SOURCE 500
+#define _ISOC99_SOURCE
-/* Let's be ISO C9X too... */
+/* Let's be ISO C99 too... */
#endif /* POSIXSOURCE_H */