diff --git a/googletest/include/gtest/internal/gtest-internal.h b/googletest/include/gtest/internal/gtest-internal.h
index 7901cd3b..da3ebd2b 100644
--- a/googletest/include/gtest/internal/gtest-internal.h
+++ b/googletest/include/gtest/internal/gtest-internal.h
@@ -1199,7 +1199,6 @@ public:
   const std::string& get() const { return value; }
 
 private:
-  AdditionalMessage& operator=(AdditionalMessage&&);
   std::string value;
 };
 
diff --git a/googletest/test/gtest_unittest.cc b/googletest/test/gtest_unittest.cc
index 2c970830..de194491 100644
--- a/googletest/test/gtest_unittest.cc
+++ b/googletest/test/gtest_unittest.cc
@@ -3748,19 +3748,6 @@ TEST(ExpectTest, ASSERT_EQ_0) {
                        "  0\n  5.6");
 }
 
-TEST(AssertionTest, AdditionalMessage) {
-  ::testing::internal::AdditionalMessage m = "servus";
-  EXPECT_EQ(m.get(), "servus");
-
-  const char* cc = "hello";
-  m = cc;
-  EXPECT_EQ(m.get(), cc);
-
-  std::string s = "hi";
-  m = s;
-  EXPECT_EQ(m.get(), s);
-}
-
 // Tests ASSERT_NE.
 TEST(AssertionTest, ASSERT_NE) {
   ASSERT_NE(6, 7);