diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -874,7 +874,7 @@
 function(cxx_add_config_site target)
   if (LIBCXX_NEEDS_SITE_CONFIG)
     if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC" OR "${CMAKE_CXX_SIMULATE_ID}" STREQUAL "MSVC")
-      target_compile_options(${target} PUBLIC "/FI\"${site_config_path}\"")
+      target_compile_options(${target} PUBLIC "/FI${site_config_path}")
     else()
       target_compile_options(${target} PUBLIC -include "${site_config_path}")
     endif()