diff --git a/lib/dns/rbtdb.c b/lib/dns/rbtdb.c
index 625891ca87..3a454c310e 100644
--- a/lib/dns/rbtdb.c
+++ b/lib/dns/rbtdb.c
@@ -171,6 +171,7 @@ typedef isc_uint64_t                    rbtdb_serial_t;
 #define cache_findrdataset cache_findrdataset64
 #define cache_findzonecut cache_findzonecut64
 #define cache_zonecut_callback cache_zonecut_callback64
+#define check_stale_rdataset check_stale_rdataset64
 #define cleanup_dead_nodes cleanup_dead_nodes64
 #define cleanup_dead_nodes_callback cleanup_dead_nodes_callback64
 #define closeversion closeversion64