diff --git a/nixos/tests/systemd-timesyncd.nix b/nixos/tests/systemd-timesyncd.nix
index ad5b9a47383b..43abd36c47d9 100644
--- a/nixos/tests/systemd-timesyncd.nix
+++ b/nixos/tests/systemd-timesyncd.nix
@@ -11,11 +11,11 @@ in {
   name = "systemd-timesyncd";
   nodes = {
     current = mkVM {};
-    pre1909 = mkVM ({lib, ... }: with lib; {
+    pre1909 = mkVM ({lib, ... }: {
       # create the path that should be migrated by our activation script when
       # upgrading to a newer nixos version
       system.stateVersion = "19.03";
-      system.activationScripts.simulate-old-timesync-state-dir = mkBefore ''
+      system.activationScripts.simulate-old-timesync-state-dir = lib.mkBefore ''
         rm -f /var/lib/systemd/timesync
         mkdir -p /var/lib/systemd /var/lib/private/systemd/timesync
         ln -s /var/lib/private/systemd/timesync /var/lib/systemd/timesync