diff --git a/src/CUDAStream.h b/src/CUDAStream.h
index 14f2cc2..451cfc1 100644
--- a/src/CUDAStream.h
+++ b/src/CUDAStream.h
@@ -6,7 +6,7 @@
 template <class T>
 class CUDAStream : public Stream<T>
 {
-  private:
+  protected:
     // Size of arrays
     unsigned int array_size;
     // Device side pointers to arrays
@@ -19,10 +19,10 @@ class CUDAStream : public Stream<T>
 
     CUDAStream(const unsigned int);
 
-    void copy();
-    void add();
-    void mul();
-    void triad();
+    virtual void copy() override;
+    virtual void add() override;
+    virtual void mul() override;
+    virtual void triad() override;
 
     void write_arrays(const std::vector<T>& a, const std::vector<T>& b, const std::vector<T>& c);
     void read_arrays(std::vector<T>& a, std::vector<T>& b, std::vector<T>& c);