diff --git a/src/conio/sdl_con.c b/src/conio/sdl_con.c
index ba1842de34ca9d66cc781028cc2cc8e6283f6f6d..da3ddeaf6d423581437d379f8c2c3475eecb4e1d 100644
--- a/src/conio/sdl_con.c
+++ b/src/conio/sdl_con.c
@@ -1,4 +1,5 @@
 #include <stdarg.h>
+#include <stdbool.h>
 #include <stdio.h>		/* NULL */
 #include <stdlib.h>
 #include <string.h>