diff --git a/Sources/Conformance/failure_list_swift.txt b/Sources/Conformance/failure_list_swift.txt
index cd1723035..c0b6cb901 100644
--- a/Sources/Conformance/failure_list_swift.txt
+++ b/Sources/Conformance/failure_list_swift.txt
@@ -1 +1,4 @@
-# Nothing failing.
+# Tracking in #1798
+Recommended.*.JsonInput.FieldNameDuplicate # Should have failed to parse, but didn't.
+Recommended.*.JsonInput.FieldNameDuplicateDifferentCasing1 # Should have failed to parse, but didn't.
+Recommended.*.JsonInput.FieldNameDuplicateDifferentCasing2 # Should have failed to parse, but didn't.