diff --git a/STD20Stream.cpp b/STD20Stream.cpp
index a7596f6..09f83d4 100644
--- a/STD20Stream.cpp
+++ b/STD20Stream.cpp
@@ -11,7 +11,7 @@
 #include <ranges>
 
 template <class T>
-STD20Stream<T>::STD20Stream(const unsigned int ARRAY_SIZE, int device)
+STD20Stream<T>::STD20Stream(const int ARRAY_SIZE, int device)
  : array_size{ARRAY_SIZE}
 {
   a = std::vector<T>(array_size);
diff --git a/STD20Stream.hpp b/STD20Stream.hpp
index db78784..a8a3c4f 100644
--- a/STD20Stream.hpp
+++ b/STD20Stream.hpp
@@ -18,7 +18,7 @@ class STD20Stream : public Stream<T>
 {
   protected:
     // Size of arrays
-    unsigned int array_size;
+    int array_size;
 
     // Device side pointers
     std::vector<T> a;
@@ -26,7 +26,7 @@ class STD20Stream : public Stream<T>
     std::vector<T> c;
 
   public:
-    STD20Stream(const unsigned int, int);
+    STD20Stream(const int, int);
     ~STD20Stream() = default;
 
     virtual void copy() override;