diff --git a/Source/DSPSpy/real_dsp.h b/Source/DSPSpy/real_dsp.h
index 5ce8513be1..27b646a962 100644
--- a/Source/DSPSpy/real_dsp.h
+++ b/Source/DSPSpy/real_dsp.h
@@ -5,11 +5,11 @@
 
 #include "dsp_interface.h"
 
-class RealDSP : public IDSP
+class RealDSP final : public IDSP
 {
 public:
-  virtual void Init();
-  virtual void Reset();
-  virtual u32 CheckMailTo();
-  virtual void SendMailTo(u32 mail);
+  void Init() override;
+  void Reset() override;
+  u32 CheckMailTo() override;
+  void SendMailTo(u32 mail) override;
 };