diff --git a/src/ur.cpp b/src/ur.cpp
index 2227340..230d123 100644
--- a/src/ur.cpp
+++ b/src/ur.cpp
@@ -13,8 +13,8 @@ using namespace std;
 
 namespace ur {
 
-UR::UR(const std::string &type, const ByteVector &cbor)
-    : type_(type), cbor_(cbor)
+UR::UR(std::string type, ByteVector cbor)
+    : type_(std::move(type)), cbor_(std::move(cbor))
 {
     if (!is_ur_type(type)) {
         throw invalid_type();
diff --git a/src/ur.hpp b/src/ur.hpp
index 6cf2fbf..6a40f40 100644
--- a/src/ur.hpp
+++ b/src/ur.hpp
@@ -24,7 +24,7 @@ class UR {
     const std::string& type() const { return type_; }
     const ByteVector& cbor() const { return cbor_; }
 
-    UR(const std::string& type, const ByteVector& cbor);
+    UR(std::string type, ByteVector cbor);
 };
 
 bool operator==(const UR& lhs, const UR& rhs);