diff --git a/libsolidity/AST.cpp b/libsolidity/AST.cpp
index 83b0adf36..09f98dca3 100644
--- a/libsolidity/AST.cpp
+++ b/libsolidity/AST.cpp
@@ -821,6 +821,7 @@ void NewExpression::checkTypeRequirements(TypePointers const*)
 		parameterTypes,
 		TypePointers{contractType},
 		strings(),
+		strings(),
 		FunctionType::Location::Creation);
 }
 
diff --git a/libsolidity/ExpressionCompiler.cpp b/libsolidity/ExpressionCompiler.cpp
index ae825be17..76d05bd0a 100644
--- a/libsolidity/ExpressionCompiler.cpp
+++ b/libsolidity/ExpressionCompiler.cpp
@@ -526,6 +526,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 					TypePointers{},
 					TypePointers{},
 					strings(),
+					strings(),
 					Location::External,
 					false,
 					true,
diff --git a/libsolidity/Types.cpp b/libsolidity/Types.cpp
index 40b0dba6f..7a5b309d9 100644
--- a/libsolidity/Types.cpp
+++ b/libsolidity/Types.cpp
@@ -1143,7 +1143,7 @@ FunctionTypePointer FunctionType::externalFunctionType() const
 			return FunctionTypePointer();
 		retParamTypes.push_back(type->externalType());
 	}
-	return make_shared<FunctionType>(paramTypes, retParamTypes, m_parameterNames, m_location, m_arbitraryParameters);
+	return make_shared<FunctionType>(paramTypes, retParamTypes, m_parameterNames, m_returnParameterNames, m_location, m_arbitraryParameters);
 }
 
 MemberList const& FunctionType::getMembers() const
@@ -1165,6 +1165,7 @@ MemberList const& FunctionType::getMembers() const
 						parseElementaryTypeVector({"uint"}),
 						TypePointers{copyAndSetGasOrValue(false, true)},
 						strings(),
+						strings(),
 						Location::SetValue,
 						false,
 						m_gasSet,
@@ -1180,6 +1181,7 @@ MemberList const& FunctionType::getMembers() const
 							parseElementaryTypeVector({"uint"}),
 							TypePointers{copyAndSetGasOrValue(true, false)},
 							strings(),
+							strings(),
 							Location::SetGas,
 							false,
 							m_gasSet,
@@ -1267,7 +1269,8 @@ TypePointer FunctionType::copyAndSetGasOrValue(bool _setGas, bool _setValue) con
 	return make_shared<FunctionType>(
 		m_parameterTypes,
 		m_returnParameterTypes,
-		strings(),
+		m_parameterNames,
+		m_returnParameterNames,
 		m_location,
 		m_arbitraryParameters,
 		m_gasSet || _setGas,
diff --git a/libsolidity/Types.h b/libsolidity/Types.h
index 49dd436d3..65a6867d6 100644
--- a/libsolidity/Types.h
+++ b/libsolidity/Types.h
@@ -573,6 +573,7 @@ public:
 		parseElementaryTypeVector(_parameterTypes),
 		parseElementaryTypeVector(_returnParameterTypes),
 		strings(),
+		strings(),
 		_location,
 		_arbitraryParameters
 	)
@@ -582,6 +583,7 @@ public:
 		TypePointers const& _parameterTypes,
 		TypePointers const& _returnParameterTypes,
 		strings _parameterNames = strings(),
+		strings _returnParameterNames = strings(),
 		Location _location = Location::Internal,
 		bool _arbitraryParameters = false,
 		bool _gasSet = false,
@@ -590,6 +592,7 @@ public:
 		m_parameterTypes (_parameterTypes),
 		m_returnParameterTypes (_returnParameterTypes),
 		m_parameterNames (_parameterNames),
+		m_returnParameterNames (_returnParameterNames),
 		m_location (_location),
 		m_arbitraryParameters (_arbitraryParameters),
 		m_gasSet (_gasSet),