diff --git a/src/ossia/dataflow/graph_node.hpp b/src/ossia/dataflow/graph_node.hpp
index 4bd9c53f2a5..beb71dd9d64 100644
--- a/src/ossia/dataflow/graph_node.hpp
+++ b/src/ossia/dataflow/graph_node.hpp
@@ -123,7 +123,7 @@ class OSSIA_EXPORT graph_node
   virtual void prepare(const execution_state& st) noexcept;
   [[nodiscard]] virtual bool consumes(const execution_state&) const noexcept;
   virtual void run(const token_request&, exec_state_facade) noexcept;
-  [[nodiscard]] virtual std::string label() const noexcept;
+  [[nodiscard]] virtual std::string label() const noexcept = 0;
 
   [[nodiscard]] bool has_port_inputs() const noexcept;
   [[nodiscard]] bool has_global_inputs() const noexcept;