diff --git a/libsolidity/AST.cpp b/libsolidity/AST.cpp
index 6028c07cf..dfb677f7e 100644
--- a/libsolidity/AST.cpp
+++ b/libsolidity/AST.cpp
@@ -505,7 +505,7 @@ void FunctionCall::checkTypeRequirements()
 			// check duplicate names
 			for (size_t i = 0; i < m_names.size(); i++) {
 				for (size_t j = i + 1; j < m_names.size(); j++) {
-					if (m_names[i] == m_names[j])
+					if (*m_names[i] == *m_names[j])
 						BOOST_THROW_EXCEPTION(createTypeError("Duplicate named argument."));
 				}
 			}
diff --git a/test/SolidityNameAndTypeResolution.cpp b/test/SolidityNameAndTypeResolution.cpp
index 1a087592c..ae6c374b4 100644
--- a/test/SolidityNameAndTypeResolution.cpp
+++ b/test/SolidityNameAndTypeResolution.cpp
@@ -868,6 +868,42 @@ BOOST_AUTO_TEST_CASE(access_to_protected_state_variable)
 	BOOST_CHECK_NO_THROW(parseTextAndResolveNames(text));
 }
 
+BOOST_AUTO_TEST_CASE(error_count_in_named_args)
+{
+	char const* sourceCode = "contract test {\n"
+							 "  function a(uint a, uint b) returns (uint r) { r = a + b; }\n"
+							 "  function b() returns (uint r) { r = a({a: 1}); }\n"
+							 "}\n";
+	BOOST_CHECK_THROW(parseTextAndResolveNames(sourceCode), TypeError);
+}
+
+BOOST_AUTO_TEST_CASE(empty_in_named_args)
+{
+	char const* sourceCode = "contract test {\n"
+							 "  function a(uint a, uint b) returns (uint r) { r = a + b; }\n"
+							 "  function b() returns (uint r) { r = a({}); }\n"
+							 "}\n";
+	BOOST_CHECK_THROW(parseTextAndResolveNames(sourceCode), TypeError);
+}
+
+BOOST_AUTO_TEST_CASE(duplicate_parameter_names_in_named_args)
+{
+	char const* sourceCode = "contract test {\n"
+							 "  function a(uint a, uint b) returns (uint r) { r = a + b; }\n"
+							 "  function b() returns (uint r) { r = a({a: 1, a: 2}); }\n"
+							 "}\n";
+	BOOST_CHECK_THROW(parseTextAndResolveNames(sourceCode), TypeError);
+}
+
+BOOST_AUTO_TEST_CASE(invalid_parameter_names_in_named_args)
+{
+	char const* sourceCode = "contract test {\n"
+							 "  function a(uint a, uint b) returns (uint r) { r = a + b; }\n"
+							 "  function b() returns (uint r) { r = a({a: 1, c: 2}); }\n"
+							 "}\n";
+	BOOST_CHECK_THROW(parseTextAndResolveNames(sourceCode), TypeError);
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }