diff --git a/src/coco/mount_and_boot.c b/src/coco/mount_and_boot.c
index 9d14d45..fd46374 100644
--- a/src/coco/mount_and_boot.c
+++ b/src/coco/mount_and_boot.c
@@ -4,6 +4,7 @@
 #include "../screen.h"
 #include "../typedefs.h"
 #include "../globals.h"
+#include "../system.h"
 
 void mount_and_boot_lobby(void)
 {
diff --git a/src/coco/scroll.c b/src/coco/scroll.c
index 4374442..95c73aa 100644
--- a/src/coco/scroll.c
+++ b/src/coco/scroll.c
@@ -4,6 +4,7 @@
 #include "../constants.h"
 #include "../globals.h"
 #include "../screen.h"
+#include "../system.h"
 #include "scroll.h"
 
 word lastTimer;