diff --git a/libs/ml/include/psemek/ml/neural_net/activation.hpp b/libs/ml/include/psemek/ml/neural_net/activation.hpp
index f336cdb9..7c9318ad 100644
--- a/libs/ml/include/psemek/ml/neural_net/activation.hpp
+++ b/libs/ml/include/psemek/ml/neural_net/activation.hpp
@@ -14,6 +14,8 @@ namespace psemek::ml
 		sigmoid,
 		tanh,
 		relu,
+
+		count,
 	};
 
 	struct unknown_activation_type