diff --git a/libevmasm/Assembly.cpp b/libevmasm/Assembly.cpp
index 7884dd191..a2c679683 100644
--- a/libevmasm/Assembly.cpp
+++ b/libevmasm/Assembly.cpp
@@ -48,11 +48,11 @@ using namespace solidity::evmasm;
 using namespace solidity::langutil;
 using namespace solidity::util;
 
-AssemblyItem const& Assembly::append(AssemblyItem const& _i)
+AssemblyItem const& Assembly::append(AssemblyItem _i)
 {
 	assertThrow(m_deposit >= 0, AssemblyException, "Stack underflow.");
 	m_deposit += static_cast<int>(_i.deposit());
-	m_items.emplace_back(_i);
+	m_items.emplace_back(move(_i));
 	if (!m_items.back().location().isValid() && m_currentSourceLocation.isValid())
 		m_items.back().setLocation(m_currentSourceLocation);
 	m_items.back().m_modifierDepth = m_currentModifierDepth;
diff --git a/libevmasm/Assembly.h b/libevmasm/Assembly.h
index 1d91c2f90..71063dd75 100644
--- a/libevmasm/Assembly.h
+++ b/libevmasm/Assembly.h
@@ -64,7 +64,7 @@ public:
 	AssemblyItem newPushImmutable(std::string const& _identifier);
 	AssemblyItem newImmutableAssignment(std::string const& _identifier);
 
-	AssemblyItem const& append(AssemblyItem const& _i);
+	AssemblyItem const& append(AssemblyItem _i);
 	AssemblyItem const& append(bytes const& _data) { return append(newData(_data)); }
 
 	template <class T> Assembly& operator<<(T const& _d) { append(_d); return *this; }