diff --git a/libevmasm/AssemblyItem.h b/libevmasm/AssemblyItem.h
index a78751719..e17179fa8 100644
--- a/libevmasm/AssemblyItem.h
+++ b/libevmasm/AssemblyItem.h
@@ -57,22 +57,26 @@ class AssemblyItem
 public:
 	enum class JumpType { Ordinary, IntoFunction, OutOfFunction };
 
-	AssemblyItem(u256 _push, langutil::SourceLocation const& _location = langutil::SourceLocation()):
-		AssemblyItem(Push, _push, _location) { }
-	AssemblyItem(solidity::Instruction _i, langutil::SourceLocation const& _location = langutil::SourceLocation()):
+	AssemblyItem(u256 _push, langutil::SourceLocation _location = langutil::SourceLocation()):
+		AssemblyItem(Push, std::move(_push), std::move(_location)) { }
+	AssemblyItem(solidity::Instruction _i, langutil::SourceLocation _location = langutil::SourceLocation()):
 		m_type(Operation),
 		m_instruction(_i),
-		m_location(_location)
+		m_location(std::move(_location))
 	{}
-	AssemblyItem(AssemblyItemType _type, u256 _data = 0, langutil::SourceLocation const& _location = langutil::SourceLocation()):
+	AssemblyItem(AssemblyItemType _type, u256 _data = 0, langutil::SourceLocation _location = langutil::SourceLocation()):
 		m_type(_type),
-		m_location(_location)
+		m_location(std::move(_location))
 	{
 		if (m_type == Operation)
 			m_instruction = Instruction(uint8_t(_data));
 		else
-			m_data = std::make_shared<u256>(_data);
+			m_data = std::make_shared<u256>(std::move(_data));
 	}
+	AssemblyItem(AssemblyItem const&) = default;
+	AssemblyItem(AssemblyItem&&) = default;
+	AssemblyItem& operator=(AssemblyItem const&) = default;
+	AssemblyItem& operator=(AssemblyItem&&) = default;
 
 	AssemblyItem tag() const { assertThrow(m_type == PushTag || m_type == Tag, Exception, ""); return AssemblyItem(Tag, data()); }
 	AssemblyItem pushTag() const { assertThrow(m_type == PushTag || m_type == Tag, Exception, ""); return AssemblyItem(PushTag, data()); }