diff --git a/Externals/gtest/cmake/internal_utils.cmake b/Externals/gtest/cmake/internal_utils.cmake
index 8878dc1a9592..6184bb26b6c3 100644
--- a/Externals/gtest/cmake/internal_utils.cmake
+++ b/Externals/gtest/cmake/internal_utils.cmake
@@ -81,8 +81,6 @@ macro(config_compiler_and_linker)
       # Suppress "unreachable code" warning on VS 2012 and later.
       # http://stackoverflow.com/questions/3232669 explains the issue.
       set(cxx_base_flags "${cxx_base_flags} -wd4702")
-    endif()
-    if (NOT (MSVC_VERSION GREATER 1900))  # 1900 is Visual Studio 2015
       # BigObj required for tests.
       set(cxx_base_flags "${cxx_base_flags} -bigobj")
     endif()
diff --git a/Externals/gtest/include/gtest/internal/gtest-port.h b/Externals/gtest/include/gtest/internal/gtest-port.h
index 0d53ad27a79b..fc7989053dd8 100644
--- a/Externals/gtest/include/gtest/internal/gtest-port.h
+++ b/Externals/gtest/include/gtest/internal/gtest-port.h
@@ -323,7 +323,7 @@
 // -std={c,gnu}++{0x,11} is passed.  The C++11 standard specifies a
 // value for __cplusplus, and recent versions of clang, gcc, and
 // probably other compilers set that too in C++11 mode.
-# if __GXX_EXPERIMENTAL_CXX0X__ || __cplusplus >= 201103L
+# if __GXX_EXPERIMENTAL_CXX0X__ || __cplusplus >= 201103L || _MSC_VER >= 1900
 // Compiling in at least C++11 mode.
 #  define GTEST_LANG_CXX11 1
 # else
@@ -355,12 +355,16 @@
 #if GTEST_STDLIB_CXX11
 # define GTEST_HAS_STD_BEGIN_AND_END_ 1
 # define GTEST_HAS_STD_FORWARD_LIST_ 1
-# define GTEST_HAS_STD_FUNCTION_ 1
+# if !defined(_MSC_VER) || (_MSC_FULL_VER >= 190023824) // works only with VS2015U2 and better
+#   define GTEST_HAS_STD_FUNCTION_ 1
+# endif
 # define GTEST_HAS_STD_INITIALIZER_LIST_ 1
 # define GTEST_HAS_STD_MOVE_ 1
 # define GTEST_HAS_STD_SHARED_PTR_ 1
 # define GTEST_HAS_STD_TYPE_TRAITS_ 1
 # define GTEST_HAS_STD_UNIQUE_PTR_ 1
+# define GTEST_HAS_UNORDERED_MAP_ 1
+# define GTEST_HAS_UNORDERED_SET_ 1
 #endif
 
 // C++11 specifies that <tuple> provides std::tuple.