diff --git a/google/protobuf/unittest_lite.proto b/google/protobuf/unittest_lite.proto
index 41ed845fe3659..878ec7c1d2081 100644
--- a/google/protobuf/unittest_lite.proto
+++ b/google/protobuf/unittest_lite.proto
@@ -386,3 +386,22 @@ message TestEmptyMessageLite{
 message TestEmptyMessageWithExtensionsLite {
   extensions 1 to max;
 }
+
+enum V1EnumLite {
+    V1_FIRST = 1;
+}
+
+enum V2EnumLite {
+    V2_FIRST = 1;
+    V2_SECOND = 2;
+}
+
+message V1MessageLite {
+    required int32 int_field = 1;
+    optional V1EnumLite enum_field = 2 [ default = V1_FIRST ];
+}
+
+message V2MessageLite {
+    required int32 int_field = 1;
+    optional V2EnumLite enum_field = 2 [ default = V2_FIRST ];
+}