diff --git a/machines/fanny/configuration.nix b/machines/fanny/configuration.nix
index be0a26c..0ea6077 100644
--- a/machines/fanny/configuration.nix
+++ b/machines/fanny/configuration.nix
@@ -91,7 +91,7 @@ in
 
   boot.initrd = {
     availableKernelModules = [ "wireguard" ];
-    postMountCommand = ''
+    postMountCommands = ''
       ip address flush dev wg-initrd
       ip link set dev wg-initrd down
     '';