diff --git a/setter/src/dos/deleted.c b/setter/src/dos/deleted.c
index d84c85d..3e4febb 100644
--- a/setter/src/dos/deleted.c
+++ b/setter/src/dos/deleted.c
@@ -28,6 +28,7 @@ Copyright (C) 2011-2021 Natalia Portillo
 
 #if defined(__WATCOMC__)
 #include <direct.h>
+#include <io.h>
 #elif defined(__DJGPP__)
 #include <unistd.h>
 #endif