diff --git a/indra/cmake/00-Common.cmake b/indra/cmake/00-Common.cmake
index 8aea50e02b1a2167b2c0fe61aebace3db1943ef3..83041d06638b22449124b1c88c730cebeb5c9d06 100644
--- a/indra/cmake/00-Common.cmake
+++ b/indra/cmake/00-Common.cmake
@@ -66,7 +66,8 @@ if (WINDOWS)
   # CP changed to only append the flag for 32bit builds - on 64bit builds,
   # locally at least, the build output is spammed with 1000s of 'D9002'
   # warnings about this switch being ignored.
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")  
+  # We need std::string_view, but that's not available without /std:c++17.
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP /std:c++17")  
   if( ADDRESS_SIZE EQUAL 32 )
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /p:PreferredToolArchitecture=x64")  
   endif()