diff --git a/src/libutil/unix/file-system.cc b/src/libutil/unix/file-system.cc
index a1941db05..7865de2e9 100644
--- a/src/libutil/unix/file-system.cc
+++ b/src/libutil/unix/file-system.cc
@@ -14,10 +14,6 @@
 
 namespace nix {
 
-namespace fs {
-using namespace std::filesystem;
-}
-
 Descriptor openDirectory(const std::filesystem::path & path)
 {
     return open(path.c_str(), O_RDONLY | O_DIRECTORY);