diff --git a/CMake/Platforms/WindowsCache.cmake b/CMake/Platforms/WindowsCache.cmake
index f5dea6aacc..ad78f37c66 100644
--- a/CMake/Platforms/WindowsCache.cmake
+++ b/CMake/Platforms/WindowsCache.cmake
@@ -56,7 +56,6 @@ else()
   set(HAVE_OPENDIR 0)
   if(MSVC)
     set(HAVE_UNISTD_H 0)
-    set(HAVE_LOCALE_H 1)
     set(HAVE_STDDEF_H 1)  # detected by CMake internally in check_type_size()
     set(HAVE_STDATOMIC_H 0)
     if(NOT MSVC_VERSION LESS 1800)