diff --git a/src/nxt_conf_validation.c b/src/nxt_conf_validation.c
index 0f22c540..218254bf 100644
--- a/src/nxt_conf_validation.c
+++ b/src/nxt_conf_validation.c
@@ -314,6 +314,9 @@ static nxt_conf_vldt_object_t  nxt_conf_vldt_http_members[] = {
     }, {
         .name       = nxt_string("idle_timeout"),
         .type       = NXT_CONF_VLDT_INTEGER,
+    }, {
+        .name       = nxt_string("large_header_buffer_size"),
+        .type       = NXT_CONF_VLDT_INTEGER,
     }, {
         .name       = nxt_string("body_buffer_size"),
         .type       = NXT_CONF_VLDT_INTEGER,