diff --git a/HCStream.cpp b/HCStream.cpp
index b1b4a9b..fb90968 100644
--- a/HCStream.cpp
+++ b/HCStream.cpp
@@ -52,7 +52,7 @@ void listDevices(void)
 
 
 template <class T>
-HCStream<T>::HCStream(const unsigned int ARRAY_SIZE, const int device_index):
+HCStream<T>::HCStream(const int ARRAY_SIZE, const int device_index):
   array_size(ARRAY_SIZE),
   d_a(ARRAY_SIZE),
   d_b(ARRAY_SIZE),
diff --git a/HCStream.h b/HCStream.h
index 4bc2b18..13d07a9 100644
--- a/HCStream.h
+++ b/HCStream.h
@@ -21,7 +21,7 @@ class HCStream : public Stream<T>
 {
 protected:
   // Size of arrays
-  unsigned int array_size;
+  int array_size;
   // Device side pointers to arrays
   hc::array<T,1> d_a;
   hc::array<T,1> d_b;
@@ -30,7 +30,7 @@ protected:
 
 public:
 
-  HCStream(const unsigned int, const int);
+  HCStream(const int, const int);
   ~HCStream();
 
   virtual void copy() override;