diff --git a/trianglix/trianglix.cpp b/trianglix/trianglix.cpp
index 966e526f..651ca983 100644
--- a/trianglix/trianglix.cpp
+++ b/trianglix/trianglix.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2014, 2015, 2016 Jonas 'Sortie' Termansen.
+ * Copyright (c) 2013, 2014, 2015, 2016, 2018 Jonas 'Sortie' Termansen.
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -37,6 +37,7 @@
 #include <poll.h>
 #include <pwd.h>
 #include <signal.h>
+#include <stdarg.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
diff --git a/utils/df.c b/utils/df.c
index ca3ccde2..c417ba45 100644
--- a/utils/df.c
+++ b/utils/df.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2016 Jonas 'Sortie' Termansen.
+ * Copyright (c) 2015, 2016, 2018 Jonas 'Sortie' Termansen.
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -27,6 +27,7 @@
 #include <fstab.h>
 #include <libgen.h>
 #include <locale.h>
+#include <stdarg.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>