diff --git a/programs/cmm/textreader/textreader.c b/programs/cmm/textreader/textreader.c
index fea1de2e16..345130723f 100644
--- a/programs/cmm/textreader/textreader.c
+++ b/programs/cmm/textreader/textreader.c
@@ -1,6 +1,7 @@
 #define MEMSIZE 4096*20
 
 #include "../lib/font.h"
+#include "../lib/io.h"
 #include "../lib/gui.h"
 #include "../lib/list_box.h"
 #include "../lib/obj/box_lib.h"