| diff --git a/third_party/protobuf/src/google/protobuf/generated_message_table_driven.h b/third_party/protobuf/src/google/protobuf/generated_message_table_driven.h |
| index 557c57d35cb4..5fa041612a0b 100644 |
| --- a/third_party/protobuf/src/google/protobuf/generated_message_table_driven.h |
| +++ b/third_party/protobuf/src/google/protobuf/generated_message_table_driven.h |
| @@ -39,7 +39,8 @@ |
| // We require C++11 and Clang to use constexpr for variables, as GCC 4.8 |
| // requires constexpr to be consistent between declarations of variables |
| // unnecessarily (see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58541). |
| -#ifdef __clang__ |
| +// VS 2017 Update 3 also supports this usage of constexpr. |
| +#if defined(__clang__) || (defined(_MSC_VER) && _MSC_VER >= 1911) |
| #define PROTOBUF_CONSTEXPR_VAR constexpr |
| #else // !__clang__ |
| #define PROTOBUF_CONSTEXPR_VAR |
