diff --git a/sdk/xtdk/xtblapi.h b/sdk/xtdk/xtblapi.h
index ececebb..ef5260f 100644
--- a/sdk/xtdk/xtblapi.h
+++ b/sdk/xtdk/xtblapi.h
@@ -36,6 +36,7 @@
 #include ARCH_HEADER(hltypes.h)
 
 /* XT Kernel runtime routines */
+#include <hlfuncs.h>
 #include <rtlfuncs.h>
 
 /* Architecture specific XT kernel routines */