diff --git a/sway/swaynag.c b/sway/swaynag.c
index f537080765..d905db2b87 100644
--- a/sway/swaynag.c
+++ b/sway/swaynag.c
@@ -1,3 +1,4 @@
+#define _POSIX_C_SOURCE 200809L
 #include <fcntl.h>
 #include <signal.h>
 #include <stdbool.h>
diff --git a/swaynag/swaynag.c b/swaynag/swaynag.c
index 893f41e443..3764071e28 100644
--- a/swaynag/swaynag.c
+++ b/swaynag/swaynag.c
@@ -3,6 +3,7 @@
 #include <assert.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
+#include <unistd.h>
 #include <wayland-client.h>
 #include <wayland-cursor.h>
 #include "log.h"