diff --git a/src/libutil/include/nix/util/file-system.hh b/src/libutil/include/nix/util/file-system.hh
index f710e982f..7d88939e3 100644
--- a/src/libutil/include/nix/util/file-system.hh
+++ b/src/libutil/include/nix/util/file-system.hh
@@ -294,7 +294,7 @@ class AutoDelete
 public:
     AutoDelete();
 
-    AutoDelete(AutoDelete && x)
+    AutoDelete(AutoDelete && x) noexcept
     {
         _path = std::move(x._path);
         del = x.del;