diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index 5b5be953767..2ff5c29c6b1 100644
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -1405,6 +1405,10 @@ function(add_unittest test_suite test_name)
     set(EXCLUDE_FROM_ALL ON)
   endif()
 
+  # Our current version of gtest uses tr1/tuple which is deprecated on MSVC.
+  # Since LLVM itself requires C++14, we can safely force it off.
+  add_definitions(-DGTEST_HAS_TR1_TUPLE=0)
+
   include_directories(${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest/include)
   include_directories(${LLVM_MAIN_SRC_DIR}/utils/unittest/googlemock/include)
   if (NOT LLVM_ENABLE_THREADS)
diff --git a/utils/unittest/CMakeLists.txt b/utils/unittest/CMakeLists.txt
index 9127ebce7b4..e7caf37727f 100644
--- a/utils/unittest/CMakeLists.txt
+++ b/utils/unittest/CMakeLists.txt
@@ -19,6 +19,9 @@ include_directories(
   googlemock
   )
 
+# Gtest 1.8.0 uses tr1/tuple which is deprecated on MSVC, so we force it off.
+add_definitions(-DGTEST_HAS_TR1_TUPLE=0)
+
 if(WIN32)
   add_definitions(-DGTEST_OS_WINDOWS=1)
 endif()