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-rw-r--r--src/internal/slibtool_mapfile_impl.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/internal/slibtool_mapfile_impl.c b/src/internal/slibtool_mapfile_impl.c
index a9c1d61..3a086de 100644
--- a/src/internal/slibtool_mapfile_impl.c
+++ b/src/internal/slibtool_mapfile_impl.c
@@ -1,3 +1,7 @@
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+#endif
+
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>