1 files changed, 1 insertions, 0 deletions
diff --git a/src/ast/expr.hpp b/src/ast/expr.hpp
index a9c82efa..6cfda001 100644
--- a/src/ast/expr.hpp
+++ b/src/ast/expr.hpp
@@ -636,6 +636,7 @@ struct ExprNode_UniOp:
 class NodeVisitor
 {
 public:
+    virtual ~NodeVisitor() = default;
     inline void visit(const unique_ptr<ExprNode>& cnode) {
         if(cnode.get())
             cnode->visit(*this);