diff --git a/nixos/modules/system/boot/luksroot.nix b/nixos/modules/system/boot/luksroot.nix
index 6e867b674398..59ebb88582ad 100644
--- a/nixos/modules/system/boot/luksroot.nix
+++ b/nixos/modules/system/boot/luksroot.nix
@@ -434,7 +434,7 @@ in
       #!$out/bin/sh -e
       if [ -e /.luksopen_args ]; then
         cryptsetup \$(cat /.luksopen_args)
-        killall cryptsetup
+        killall -q cryptsetup
       else
         echo "Passphrase is not requested now"
         exit 1