diff --git a/include/labwc.h b/include/labwc.h
index 81ef4467..974381d1 100644
--- a/include/labwc.h
+++ b/include/labwc.h
@@ -5,7 +5,6 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <sys/time.h>
 #include <time.h>
 #include <unistd.h>
 #include <wayland-server-core.h>
diff --git a/src/output.c b/src/output.c
index f34f7ac5..c121c35d 100644
--- a/src/output.c
+++ b/src/output.c
@@ -1,3 +1,4 @@
+#define _POSIX_C_SOURCE 200809L
 #include <wlr/types/wlr_xdg_output_v1.h>
 #include "labwc.h"
 #include "theme/theme.h"