diff --git a/include/ghc/filesystem.hpp b/include/ghc/filesystem.hpp
index 3a2bbe7..82ea1fe 100644
--- a/include/ghc/filesystem.hpp
+++ b/include/ghc/filesystem.hpp
@@ -5134,6 +5134,5 @@ GHC_INLINE recursive_directory_iterator end(const recursive_directory_iterator&)
 // cleanup some macros
 #undef GHC_INLINE
 #undef GHC_EXPAND_IMPL
-#undef GHC_USE_WCHAR_T
 
 #endif  // GHC_FILESYSTEM_H