diff --git a/sdk/xtdk/xtbmapi.h b/sdk/xtdk/xtbmapi.h
index d0de696..cd77ffa 100644
--- a/sdk/xtdk/xtbmapi.h
+++ b/sdk/xtdk/xtbmapi.h
@@ -28,6 +28,7 @@
 
 /* Architecture independent XT kernel data types */
 #include <hltypes.h>
+#include <iotypes.h>
 #include <rtltypes.h>
 
 /* Architecture dependent XT kernel data types */