diff --git a/test/libsolidity/SolidityTypes.cpp b/test/libsolidity/SolidityTypes.cpp
index e171d97491b3..ee6372617cbc 100644
--- a/test/libsolidity/SolidityTypes.cpp
+++ b/test/libsolidity/SolidityTypes.cpp
@@ -157,9 +157,7 @@ BOOST_AUTO_TEST_CASE(type_identifiers)
 	BOOST_CHECK_EQUAL(RationalNumberType(rational(7, 1)).identifier(), "t_rational_7_by_1");
 	BOOST_CHECK_EQUAL(RationalNumberType(rational(200, 77)).identifier(), "t_rational_200_by_77");
 	BOOST_CHECK_EQUAL(RationalNumberType(rational(2 * 200, 2 * 77)).identifier(), "t_rational_200_by_77");
-	BOOST_CHECK_EQUAL(RationalNumberType(rational(-2 * 200, -2 * 77)).identifier(), "t_rational_200_by_77");
 	BOOST_CHECK_EQUAL(RationalNumberType(rational(-2 * 200, 2 * 77)).identifier(), "t_rational_minus_200_by_77");
-	BOOST_CHECK_EQUAL(RationalNumberType(rational(2 * 200, -2 * 77)).identifier(), "t_rational_minus_200_by_77");
 	BOOST_CHECK_EQUAL(
 		StringLiteralType(Literal(SourceLocation{}, Token::StringLiteral, make_shared<string>("abc - def"))).identifier(),
 		 "t_stringliteral_196a9142ee0d40e274a6482393c762b16dd8315713207365e1e13d8d85b74fc4"