diff --git a/libdevcore/Common.h b/libdevcore/Common.h
index 0967596e2..9fefea45a 100644
--- a/libdevcore/Common.h
+++ b/libdevcore/Common.h
@@ -80,6 +80,9 @@ using StringMap = std::map<std::string, std::string>;
 using u256Map = std::map<u256, u256>;
 using HexMap = std::map<bytes, std::string>;
 
+// String types.
+using strings = std::vector<std::string>;
+
 // Fixed-length string types.
 using string32 = std::array<char, 32>;
 
diff --git a/libsolidity/GlobalContext.cpp b/libsolidity/GlobalContext.cpp
index 26a52fd10..92ca9548a 100644
--- a/libsolidity/GlobalContext.cpp
+++ b/libsolidity/GlobalContext.cpp
@@ -38,25 +38,25 @@ m_magicVariables(vector<shared_ptr<MagicVariableDeclaration const>>{make_shared<
 					make_shared<MagicVariableDeclaration>("msg", make_shared<MagicType>(MagicType::Kind::MSG)),
 					make_shared<MagicVariableDeclaration>("tx", make_shared<MagicType>(MagicType::Kind::TX)),
 					make_shared<MagicVariableDeclaration>("suicide",
-							make_shared<FunctionType>(vector<string>{"address"}, vector<string>{}, FunctionType::Location::SUICIDE)),
+							make_shared<FunctionType>(strings{"address"}, strings{}, FunctionType::Location::SUICIDE)),
 					make_shared<MagicVariableDeclaration>("sha3",
-							make_shared<FunctionType>(vector<string>{"hash"}, vector<string>{"hash"}, FunctionType::Location::SHA3)),
+							make_shared<FunctionType>(strings{"hash"}, strings{"hash"}, FunctionType::Location::SHA3)),
 					make_shared<MagicVariableDeclaration>("log0",
-							make_shared<FunctionType>(vector<string>{"hash"},vector<string>{}, FunctionType::Location::LOG0)),
+							make_shared<FunctionType>(strings{"hash"},strings{}, FunctionType::Location::LOG0)),
 					make_shared<MagicVariableDeclaration>("log1",
-							make_shared<FunctionType>(vector<string>{"hash", "hash"},vector<string>{}, FunctionType::Location::LOG1)),
+							make_shared<FunctionType>(strings{"hash", "hash"},strings{}, FunctionType::Location::LOG1)),
 					make_shared<MagicVariableDeclaration>("log2",
-							make_shared<FunctionType>(vector<string>{"hash", "hash", "hash"},vector<string>{}, FunctionType::Location::LOG2)),
+							make_shared<FunctionType>(strings{"hash", "hash", "hash"},strings{}, FunctionType::Location::LOG2)),
 					make_shared<MagicVariableDeclaration>("log3",
-							make_shared<FunctionType>(vector<string>{"hash", "hash", "hash", "hash"},vector<string>{}, FunctionType::Location::LOG3)),
+							make_shared<FunctionType>(strings{"hash", "hash", "hash", "hash"},strings{}, FunctionType::Location::LOG3)),
 					make_shared<MagicVariableDeclaration>("log4",
-							make_shared<FunctionType>(vector<string>{"hash", "hash", "hash", "hash", "hash"},vector<string>{}, FunctionType::Location::LOG4)),
+							make_shared<FunctionType>(strings{"hash", "hash", "hash", "hash", "hash"},strings{}, FunctionType::Location::LOG4)),
 					make_shared<MagicVariableDeclaration>("sha256",
-							make_shared<FunctionType>(vector<string>{"hash"}, vector<string>{"hash"}, FunctionType::Location::SHA256)),
+							make_shared<FunctionType>(strings{"hash"}, strings{"hash"}, FunctionType::Location::SHA256)),
 					make_shared<MagicVariableDeclaration>("ecrecover",
-							make_shared<FunctionType>(vector<string>{"hash", "hash8", "hash", "hash"}, vector<string>{"address"}, FunctionType::Location::ECRECOVER)),
+							make_shared<FunctionType>(strings{"hash", "hash8", "hash", "hash"}, strings{"address"}, FunctionType::Location::ECRECOVER)),
 					make_shared<MagicVariableDeclaration>("ripemd160",
-							make_shared<FunctionType>(vector<string>{"hash"}, vector<string>{"hash160"}, FunctionType::Location::RIPEMD160))})
+							make_shared<FunctionType>(strings{"hash"}, strings{"hash160"}, FunctionType::Location::RIPEMD160))})
 {
 }
 
diff --git a/libsolidity/Types.cpp b/libsolidity/Types.cpp
index b3eae2025..7ca1dc6d5 100644
--- a/libsolidity/Types.cpp
+++ b/libsolidity/Types.cpp
@@ -205,11 +205,11 @@ TypePointer IntegerType::binaryOperatorResult(Token::Value _operator, TypePointe
 
 const MemberList IntegerType::AddressMemberList =
 	MemberList({{"balance", make_shared<IntegerType >(256)},
-				{"callstring32", make_shared<FunctionType>(vector<string>{"string32"},
-														   vector<string>{}, FunctionType::Location::BARE)},
-				{"callstring32string32", make_shared<FunctionType>(vector<string>{"string32", "string32"},
-																   vector<string>{}, FunctionType::Location::BARE)},
-				{"send", make_shared<FunctionType>(vector<string>{"uint"}, vector<string>{}, FunctionType::Location::SEND)}});
+				{"callstring32", make_shared<FunctionType>(strings{"string32"}, strings{},
+														   FunctionType::Location::BARE)},
+				{"callstring32string32", make_shared<FunctionType>(strings{"string32", "string32"},
+																   strings{}, FunctionType::Location::BARE)},
+				{"send", make_shared<FunctionType>(strings{"uint"}, strings{}, FunctionType::Location::SEND)}});
 
 shared_ptr<IntegerConstantType const> IntegerConstantType::fromLiteral(string const& _literal)
 {
@@ -619,7 +619,7 @@ string FunctionType::getCanonicalSignature() const
 	return ret + ")";
 }
 
-TypePointers FunctionType::parseElementaryTypeVector(vector<string> const& _types)
+TypePointers FunctionType::parseElementaryTypeVector(strings const& _types)
 {
 	TypePointers pointers;
 	pointers.reserve(_types.size());
diff --git a/libsolidity/Types.h b/libsolidity/Types.h
index 031d45ea5..deabe1160 100644
--- a/libsolidity/Types.h
+++ b/libsolidity/Types.h
@@ -352,10 +352,10 @@ public:
 
 	virtual Category getCategory() const override { return Category::FUNCTION; }
 	explicit FunctionType(FunctionDefinition const& _function, bool _isInternal = true);
-	FunctionType(std::vector<std::string> const& _parameterTypes,
-				 std::vector<std::string> const& _returnParameterTypes,
+	FunctionType(strings const& _parameterTypes, strings const& _returnParameterTypes,
 				 Location _location = Location::INTERNAL):
-		FunctionType(parseElementaryTypeVector(_parameterTypes), parseElementaryTypeVector(_returnParameterTypes), _location) {}
+		FunctionType(parseElementaryTypeVector(_parameterTypes), parseElementaryTypeVector(_returnParameterTypes),
+					 _location) {}
 	FunctionType(TypePointers const& _parameterTypes, TypePointers const& _returnParameterTypes,
 				 Location _location = Location::INTERNAL):
 		m_parameterTypes(_parameterTypes), m_returnParameterTypes(_returnParameterTypes),
@@ -375,7 +375,7 @@ public:
 	std::string getCanonicalSignature() const;
 
 private:
-	static TypePointers parseElementaryTypeVector(std::vector<std::string> const& _types);
+	static TypePointers parseElementaryTypeVector(strings const& _types);
 
 	TypePointers m_parameterTypes;
 	TypePointers m_returnParameterTypes;