diff --git a/conformance/failure_list_csharp.txt b/conformance/failure_list_csharp.txt
index ed6ee9779..f82f0f2d4 100644
--- a/conformance/failure_list_csharp.txt
+++ b/conformance/failure_list_csharp.txt
@@ -1,3 +1,4 @@
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
 Required.Proto2.JsonInput.StoresDefaultPrimitive.Validator
+Recommended.Proto2.JsonInput.FieldNameExtension.Validator
diff --git a/conformance/failure_list_php.txt b/conformance/failure_list_php.txt
index 70c668a9e..1c7f92bc9 100644
--- a/conformance/failure_list_php.txt
+++ b/conformance/failure_list_php.txt
@@ -1,6 +1,7 @@
 Recommended.FieldMaskNumbersDontRoundTrip.JsonOutput
 Recommended.FieldMaskPathsDontRoundTrip.JsonOutput
 Recommended.FieldMaskTooManyUnderscore.JsonOutput
+Recommended.Proto2.JsonInput.FieldNameExtension.Validator
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
 Recommended.Proto3.JsonInput.FieldMaskInvalidCharacter
diff --git a/conformance/failure_list_php_c.txt b/conformance/failure_list_php_c.txt
index d9e3e60c0..f6c6bc8d2 100644
--- a/conformance/failure_list_php_c.txt
+++ b/conformance/failure_list_php_c.txt
@@ -1,6 +1,7 @@
 Recommended.FieldMaskNumbersDontRoundTrip.JsonOutput
 Recommended.FieldMaskPathsDontRoundTrip.JsonOutput
 Recommended.FieldMaskTooManyUnderscore.JsonOutput
+Recommended.Proto2.JsonInput.FieldNameExtension.Validator
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
 Recommended.Proto3.JsonInput.DurationHas3FractionalDigits.Validator
diff --git a/conformance/failure_list_php_c_32.txt b/conformance/failure_list_php_c_32.txt
index b3e20e007..280e5ff3f 100644
--- a/conformance/failure_list_php_c_32.txt
+++ b/conformance/failure_list_php_c_32.txt
@@ -1,6 +1,7 @@
 Recommended.FieldMaskNumbersDontRoundTrip.JsonOutput
 Recommended.FieldMaskPathsDontRoundTrip.JsonOutput
 Recommended.FieldMaskTooManyUnderscore.JsonOutput
+Recommended.Proto2.JsonInput.FieldNameExtension.Validator
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
 Recommended.Proto3.JsonInput.DurationHas3FractionalDigits.Validator
diff --git a/conformance/failure_list_ruby.txt b/conformance/failure_list_ruby.txt
index 6b094371d..ff206dc55 100644
--- a/conformance/failure_list_ruby.txt
+++ b/conformance/failure_list_ruby.txt
@@ -1,6 +1,7 @@
 Recommended.FieldMaskNumbersDontRoundTrip.JsonOutput
 Recommended.FieldMaskPathsDontRoundTrip.JsonOutput
 Recommended.FieldMaskTooManyUnderscore.JsonOutput
+Recommended.Proto2.JsonInput.FieldNameExtension.Validator
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput
 Recommended.Proto3.JsonInput.DurationHas3FractionalDigits.Validator