diff --git a/include/linux/kernel-page-flags.h b/include/linux/kernel-page-flags.h
index bd92a89..26a6571 100644
--- a/include/linux/kernel-page-flags.h
+++ b/include/linux/kernel-page-flags.h
@@ -30,6 +30,7 @@
 #define KPF_NOPAGE		20
 
 #define KPF_KSM			21
+#define KPF_THP			22
 
 /* kernel hacking assistances
  * WARNING: subject to change, never rely on them!