diff --git a/src/treelearner/gradient_discretizer.hpp b/src/treelearner/gradient_discretizer.hpp
index 352788f7d093..f6d3e8939477 100644
--- a/src/treelearner/gradient_discretizer.hpp
+++ b/src/treelearner/gradient_discretizer.hpp
@@ -30,7 +30,7 @@ class GradientDiscretizer {
     stochastic_rounding_ = stochastic_rounding;
   }
 
-  ~GradientDiscretizer() {}
+  virtual ~GradientDiscretizer() {}
 
   virtual void DiscretizeGradients(
     const data_size_t num_data,