diff --git a/pkgs/os-specific/linux/nixos-rebuild/nixos-rebuild.sh b/pkgs/os-specific/linux/nixos-rebuild/nixos-rebuild.sh
index 43d5653156cb..9e4fde59172c 100755
--- a/pkgs/os-specific/linux/nixos-rebuild/nixos-rebuild.sh
+++ b/pkgs/os-specific/linux/nixos-rebuild/nixos-rebuild.sh
@@ -141,7 +141,7 @@ while [ "$#" -gt 0 ]; do
         fi
         if [ "$1" != system ]; then
             profile="/nix/var/nix/profiles/system-profiles/$1"
-            mkdir -p -m 0755 "$(dirname "$profile")"
+            (umask 022 && mkdir -p "$(dirname "$profile")")
         fi
         shift 1
         ;;