diff --git a/tests/co19/co19-dart2js.status b/tests/co19/co19-dart2js.status
index 94cd7c1..2073134 100644
--- a/tests/co19/co19-dart2js.status
+++ b/tests/co19/co19-dart2js.status
@@ -24,6 +24,7 @@
 Language/Libraries_and_Scripts/Scripts/top_level_syntax_t01: SkipByDesign # Non-JS-interop external members are not supported
 Language/Libraries_and_Scripts/top_level_syntax_t01: SkipByDesign # Non-JS-interop external members are not supported
 Language/Reference/Operator_Precedence/precedence_15_unary_prefix_t08: SkipByDesign # binary '~' produces different results in JavaScript and Dart
+Language/Types/Interface_Types/subtype_t27: Skip # https://github.com/dart-lang/sdk/issues/42641
 LanguageFeatures/Abstract-external-fields/static_analysis_external_A01_t01: SkipByDesign # Non-JS-interop external members are not supported
 LanguageFeatures/Abstract-external-fields/static_analysis_external_A01_t02: SkipByDesign # Non-JS-interop external members are not supported
 LanguageFeatures/Abstract-external-fields/static_analysis_external_A01_t03: SkipByDesign # Non-JS-interop external members are not supported
diff --git a/tests/co19_2/co19_2-dart2js.status b/tests/co19_2/co19_2-dart2js.status
index c5d8002..a63fb39 100644
--- a/tests/co19_2/co19_2-dart2js.status
+++ b/tests/co19_2/co19_2-dart2js.status
@@ -20,6 +20,7 @@
 Language/Libraries_and_Scripts/Scripts/top_level_syntax_t01: SkipByDesign # Non-JS-interop external members are not supported
 Language/Libraries_and_Scripts/top_level_syntax_t01: SkipByDesign # Non-JS-interop external members are not supported
 Language/Reference/Operator_Precedence/precedence_15_unary_prefix_t08: SkipByDesign # binary '~' produces different results in JavaScript and Dart
+Language/Types/Interface_Types/subtype_t27: Skip # https://github.com/dart-lang/sdk/issues/42641
 LibTest/core/DateTime/DateTime.fromMicrosecondsSinceEpoch_A01_t01: SkipByDesign # microseconds are not supported in JavaScript
 LibTest/core/DateTime/microsecond_A01_t01: SkipByDesign # microseconds are not supported in JavaScript
 LibTest/core/DateTime/microsecondsSinceEpoch_A01_t01: SkipByDesign # microseconds are not supported in JavaScript