1 files changed, 1 insertions, 0 deletions
diff --git a/src/hir/expr.hpp b/src/hir/expr.hpp
index 2ca960e3..c87ae3a7 100644
--- a/src/hir/expr.hpp
+++ b/src/hir/expr.hpp
@@ -821,6 +821,7 @@ struct ExprNode_Closure:
 class ExprVisitor
 {
 public:
+    virtual ~ExprVisitor() = default;
     virtual void visit_node_ptr(::std::unique_ptr<ExprNode>& node_ptr);
     virtual void visit_node(ExprNode& node);
     #define NV(nt)  virtual void visit(nt& n) = 0;