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-rw-r--r--include/dalist/dalist_env.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/dalist/dalist_env.h b/include/dalist/dalist_env.h
index 2f2b57a..8c8ab0f 100644
--- a/include/dalist/dalist_env.h
+++ b/include/dalist/dalist_env.h
@@ -7,6 +7,10 @@
#else
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 500
+#endif
+
#include <stdint.h>
#include <stdio.h>
#include <errno.h>