diff --git a/lib/dns/rbtdb.c b/lib/dns/rbtdb.c
index be9008d948..3d16d45bf4 100644
--- a/lib/dns/rbtdb.c
+++ b/lib/dns/rbtdb.c
@@ -304,7 +304,7 @@ typedef ISC_LIST(dns_rbtnode_t) rbtnodelist_t;
 	(((header)->rdh_ttl > (now)) || \
 	 ((header)->rdh_ttl == (now) && ZEROTTL(header)))
 
-#define DEFAULT_NODE_LOCK_COUNT	   7 /*%< Should be prime. */
+#define DEFAULT_NODE_LOCK_COUNT	   53 /*%< Should be prime. */
 #define RBTDB_GLUE_TABLE_INIT_SIZE 2U
 
 /*%
@@ -324,7 +324,7 @@ typedef ISC_LIST(dns_rbtnode_t) rbtnodelist_t;
 #define DEFAULT_CACHE_NODE_LOCK_COUNT DNS_RBTDB_CACHE_NODE_LOCK_COUNT
 #endif /* if DNS_RBTDB_CACHE_NODE_LOCK_COUNT <= 1 */
 #else  /* ifdef DNS_RBTDB_CACHE_NODE_LOCK_COUNT */
-#define DEFAULT_CACHE_NODE_LOCK_COUNT 16
+#define DEFAULT_CACHE_NODE_LOCK_COUNT 97
 #endif /* DNS_RBTDB_CACHE_NODE_LOCK_COUNT */
 
 typedef struct {