diff --git a/src/state/render_state.hpp b/src/state/render_state.hpp
index e289c5b..e44a956 100644
--- a/src/state/render_state.hpp
+++ b/src/state/render_state.hpp
@@ -10,6 +10,7 @@ class render_context;
 
 class render_state {
  public:
+  virtual ~render_state() {}
   virtual std::string render(render_context& context, const token& token) = 0;
 };