diff --git a/src/CUDAStream.cu b/src/CUDAStream.cu
index 5ec1e67..7c9afb3 100644
--- a/src/CUDAStream.cu
+++ b/src/CUDAStream.cu
@@ -32,6 +32,17 @@ CUDAStream<T>::CUDAStream(const unsigned int ARRAY_SIZE)
 }
 
 
+template <class T>
+CUDAStream<T>::~CUDAStream()
+{
+  cudaFree(d_a);
+  check_error();
+  cudaFree(d_b);
+  check_error();
+  cudaFree(d_c);
+  check_error();
+}
+
 template <class T>
 void CUDAStream<T>::write_arrays(const std::vector<T>& a, const std::vector<T>& b, const std::vector<T>& c)
 {
diff --git a/src/CUDAStream.h b/src/CUDAStream.h
index bde574e..89ad536 100644
--- a/src/CUDAStream.h
+++ b/src/CUDAStream.h
@@ -19,6 +19,7 @@ class CUDAStream : public Stream<T>
   public:
 
     CUDAStream(const unsigned int);
+    ~CUDAStream();
 
     virtual void copy() override;
     virtual void add() override;