diff --git a/src/runtime/tree.c b/src/runtime/tree.c
index 2e2a5d89..04aa6e5f 100644
--- a/src/runtime/tree.c
+++ b/src/runtime/tree.c
@@ -69,6 +69,7 @@ void ts_tree_assign_parents(TSTree *self) {
 void ts_tree_set_children(TSTree *self, size_t child_count, TSTree **children) {
   self->children = children;
   self->child_count = child_count;
+  self->named_child_count = 0;
   self->visible_child_count = 0;
   for (size_t i = 0; i < child_count; i++) {
     TSTree *child = children[i];