diff --git a/peglib.h b/peglib.h
index 056323f..d7f239c 100644
--- a/peglib.h
+++ b/peglib.h
@@ -1104,6 +1104,8 @@ struct Ope::Visitor
 
 struct AssignIDToDefinition : public Ope::Visitor
 {
+    using Ope::Visitor::visit;
+
     void visit(Sequence& ope) override {
         for (auto op: ope.opes_) {
             op->accept(*this);
@@ -1133,6 +1135,8 @@ struct IsToken : public Ope::Visitor
 {
     IsToken() : has_token_boundary(false), has_rule(false) {}
 
+    using Ope::Visitor::visit;
+
     void visit(Sequence& ope) override {
         for (auto op: ope.opes_) {
             op->accept(*this);
@@ -1661,6 +1665,8 @@ private:
         DetectLeftRecursion(const std::string& name)
             : s_(nullptr), name_(name), done_(false) {}
 
+        using Ope::Visitor::visit;
+
         void visit(Sequence& ope) override {
             for (auto op: ope.opes_) {
                 op->accept(*this);