diff --git a/build-libcxx.sh b/build-libcxx.sh
index e0ff2bf..0308044 100755
--- a/build-libcxx.sh
+++ b/build-libcxx.sh
@@ -162,7 +162,6 @@ build_all() {
             -DLIBCXX_SUPPORTS_STD_EQ_CXX11_FLAG=TRUE \
             -DLIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB=TRUE \
             -DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF \
-            -DLIBCXX_ENABLE_FILESYSTEM=OFF \
             -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=TRUE \
             -DLIBCXX_ENABLE_NEW_DELETE_DEFINITIONS=ON \
             -DLIBCXX_CXX_ABI=libcxxabi \