diff --git a/paddle/framework/net.h b/paddle/framework/net.h
index e60356dc1728488dab8c218d8ebe585ed5d28ad2..2025bfa4b236602ae580ef6bc75c80f837e22923 100644
--- a/paddle/framework/net.h
+++ b/paddle/framework/net.h
@@ -91,6 +91,8 @@ class Net {
    * @brief Create a network.
    */
   static std::unique_ptr<Net> Create(const NetDesc &def = NetDesc());
+
+  virtual ~Net() {}
 };
 
 /**
@@ -140,6 +142,8 @@ class PlainNet : public Net {
    */
   virtual void AddBackwardOps() override;
 
+  virtual ~PlainNet() override {}
+
  protected:
   /**
    * @brief Build the network.