diff --git a/libsolidity/analysis/ContractLevelChecker.cpp b/libsolidity/analysis/ContractLevelChecker.cpp
index e0f2747e0..1da4863ff 100644
--- a/libsolidity/analysis/ContractLevelChecker.cpp
+++ b/libsolidity/analysis/ContractLevelChecker.cpp
@@ -51,7 +51,7 @@ vector<ASTPointer<UserDefinedTypeName>> sortByContract(vector<ASTPointer<UserDef
 {
 	auto sorted = _list;
 
-	sort(sorted.begin(), sorted.end(),
+	stable_sort(sorted.begin(), sorted.end(),
 		[] (ASTPointer<UserDefinedTypeName> _a, ASTPointer<UserDefinedTypeName> _b) {
 			if (!_a || !_b)
 				return _a < _b;
diff --git a/test/libsolidity/syntaxTests/inheritance/override/override_multiple_duplicated.sol b/test/libsolidity/syntaxTests/inheritance/override/override_multiple_duplicated.sol
index 9c24655c3..bf65c2d0c 100644
--- a/test/libsolidity/syntaxTests/inheritance/override/override_multiple_duplicated.sol
+++ b/test/libsolidity/syntaxTests/inheritance/override/override_multiple_duplicated.sol
@@ -25,7 +25,7 @@ contract X is A, B, C, D {
 // TypeError: (237-295): Contract "C" should be marked as abstract.
 // TypeError: (296-399): Contract "D" should be marked as abstract.
 // TypeError: (498-499): Duplicate contract "D" found in override list of "test".
-// TypeError: (560-561): Duplicate contract "B" found in override list of "foo".
+// TypeError: (563-564): Duplicate contract "B" found in override list of "foo".
 // TypeError: (566-567): Duplicate contract "B" found in override list of "foo".
 // TypeError: (572-573): Duplicate contract "D" found in override list of "foo".
 // TypeError: (400-595): Contract "X" should be marked as abstract.