diff --git a/nixos/modules/config/users-groups.nix b/nixos/modules/config/users-groups.nix
index d1e9c8072eac..4640a0f3d6be 100644
--- a/nixos/modules/config/users-groups.nix
+++ b/nixos/modules/config/users-groups.nix
@@ -652,7 +652,7 @@ in {
       deps = [ "users" ];
       text = ''
         users=()
-        while IFS=: read -r user hash tail; do
+        while IFS=: read -r user hash _; do
           if [[ "$hash" = "$"* && ! "$hash" =~ ^\''$${cryptSchemeIdPatternGroup}\$ ]]; then
             users+=("$user")
           fi