diff --git a/googletest/include/gtest/internal/gtest-internal.h b/googletest/include/gtest/internal/gtest-internal.h
index 6bad8780..7f1a5b00 100644
--- a/googletest/include/gtest/internal/gtest-internal.h
+++ b/googletest/include/gtest/internal/gtest-internal.h
@@ -90,7 +90,9 @@
 #define GTEST_STRINGIFY_HELPER_(name, ...) #name
 #define GTEST_STRINGIFY_(...) GTEST_STRINGIFY_HELPER_(__VA_ARGS__, )
 
-namespace proto2 { class Message; }
+namespace proto2 {
+class MessageLite;
+}
 
 namespace testing {
 
@@ -879,10 +881,10 @@ class GTEST_API_ Random {
   typename std::remove_const<typename std::remove_reference<T>::type>::type
 
 // IsAProtocolMessage<T>::value is a compile-time bool constant that's
-// true if and only if T is type proto2::Message or a subclass of it.
+// true if and only if T is type proto2::MessageLite or a subclass of it.
 template <typename T>
 struct IsAProtocolMessage
-    : public std::is_convertible<const T*, const ::proto2::Message*> {};
+    : public std::is_convertible<const T*, const ::proto2::MessageLite*> {};
 
 // When the compiler sees expression IsContainerTest<C>(0), if C is an
 // STL-style container class, the first overload of IsContainerTest
diff --git a/googletest/test/gtest_unittest.cc b/googletest/test/gtest_unittest.cc
index f3b72169..005a2d40 100644
--- a/googletest/test/gtest_unittest.cc
+++ b/googletest/test/gtest_unittest.cc
@@ -7104,7 +7104,7 @@ class ConversionHelperDerived : public ConversionHelperBase {};
 
 // Tests that IsAProtocolMessage<T>::value is a compile-time constant.
 TEST(IsAProtocolMessageTest, ValueIsCompileTimeConstant) {
-  GTEST_COMPILE_ASSERT_(IsAProtocolMessage<::proto2::Message>::value,
+  GTEST_COMPILE_ASSERT_(IsAProtocolMessage<::proto2::MessageLite>::value,
                         const_true);
   GTEST_COMPILE_ASSERT_(!IsAProtocolMessage<int>::value, const_false);
 }
@@ -7112,7 +7112,7 @@ TEST(IsAProtocolMessageTest, ValueIsCompileTimeConstant) {
 // Tests that IsAProtocolMessage<T>::value is true when T is
 // proto2::Message or a sub-class of it.
 TEST(IsAProtocolMessageTest, ValueIsTrueWhenTypeIsAProtocolMessage) {
-  EXPECT_TRUE(IsAProtocolMessage< ::proto2::Message>::value);
+  EXPECT_TRUE(IsAProtocolMessage<::proto2::MessageLite>::value);
 }
 
 // Tests that IsAProtocolMessage<T>::value is false when T is neither