diff --git a/include/raii/binary.hpp b/include/raii/binary.hpp
index e9138f6..acb3e61 100644
--- a/include/raii/binary.hpp
+++ b/include/raii/binary.hpp
@@ -71,8 +71,12 @@ namespace raii{
 	public:
 		constexpr binary_data(void) = default;
 		binary_data(char* data, size_t size):
+			binary_base(data, size){}
+		binary_data(const char* data, size_t size):
 			binary_base(reinterpret_cast<char*>(Allocator::copy(data, size)), size){}
 		binary_data(char* data, size_t cap, size_t size):
+			binary_base(data, cap, size){}
+		binary_data(const char* data, size_t cap, size_t size):
 			binary_base(reinterpret_cast<char*>(Allocator::copy(data, size)), cap, size){}
 		binary_data(size_t size):
 			binary_base(reinterpret_cast<char*>(Allocator::allocate(size)), size){}