diff --git a/overlay.nix b/overlay.nix
index 42a8e78..0a30478 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -67,6 +67,9 @@ extraPkgs // {
         });
     in chrony'.override {
       gnutls = null;
+      nss = null;
+      nspr = null;
+      readline = null;
       libedit = null;
       libseccomp = null;
       # should texinfo be in nativeBuildInputs instead of