diff --git a/src/gui/curses/gui-curses-window.c b/src/gui/curses/gui-curses-window.c
index 7c20cc1a6..2db24ab52 100644
--- a/src/gui/curses/gui-curses-window.c
+++ b/src/gui/curses/gui-curses-window.c
@@ -25,6 +25,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <stdarg.h>
 #include <libgen.h>
 #include <sys/ioctl.h>