diff --git a/include/types/backend.h b/include/types/backend.h
index 57d17bd..6325be2 100644
--- a/include/types/backend.h
+++ b/include/types/backend.h
@@ -114,6 +114,7 @@
 /* BE_LB_HFCN_* is the hash function, to be used with BE_LB_HASH_FUNC */
 #define BE_LB_HFCN_SDBM   0x000000 /* sdbm hash */
 #define BE_LB_HFCN_DJB2   0x400000 /* djb2 hash */
+#define BE_LB_HFCN_WT6    0x800000 /* wt6 hash */
 #define BE_LB_HASH_FUNC   0xC00000 /* get/clear hash function */