diff --git a/iso.nix b/iso.nix
index bbb2426..061db43 100644
--- a/iso.nix
+++ b/iso.nix
@@ -20,19 +20,20 @@
   networking.hostId = lib.mkDefault "8425e349";
 
   environment.systemPackages = with pkgs; [
-    pkgs.w3m-nographics # needed for the manual anyway
-    pkgs.testdisk # useful for repairing boot problems
-    pkgs.ms-sys # for writing Microsoft boot sectors / MBRs
-    pkgs.efibootmgr
-    pkgs.efivar
-    pkgs.parted
-    pkgs.gptfdisk
-    pkgs.ddrescue
-    pkgs.ccrypt
-    pkgs.cryptsetup # needed for dm-crypt volumes
+    w3m-nographics # needed for the manual anyway
+    testdisk # useful for repairing boot problems
+    ms-sys # for writing Microsoft boot sectors / MBRs
+    efibootmgr
+    efivar
+    htop
+    parted
+    gptfdisk
+    ddrescue
+    ccrypt
+    cryptsetup # needed for dm-crypt volumes
 
     # Some text editors.
-    (pkgs.vim.customize {
+    (vim.customize {
       name = "vim";
       vimrcConfig.customRC = ''
         filetype plugin indent on
@@ -48,24 +49,24 @@
     })
 
     # Some networking tools.
-    pkgs.fuse
-    pkgs.fuse3
-    pkgs.sshfs-fuse
-    pkgs.socat
-    pkgs.screen
-    pkgs.tcpdump
+    fuse
+    fuse3
+    sshfs-fuse
+    socat
+    screen
+    tcpdump
 
     # Hardware-related tools.
-    pkgs.sdparm
-    pkgs.hdparm
-    pkgs.smartmontools # for diagnosing hard disks
-    pkgs.pciutils
-    pkgs.usbutils
-    pkgs.nvme-cli
+    sdparm
+    hdparm
+    smartmontools # for diagnosing hard disks
+    pciutils
+    usbutils
+    nvme-cli
 
     # Some compression/archiver tools.
-    pkgs.unzip
-    pkgs.zip
+    unzip
+    zip
   ];
 
   time.timeZone = "Europe/Berlin";
@@ -80,4 +81,4 @@
 
   networking.dhcpcd.enable = false;
   networking.useDHCP = false;
-}
\ No newline at end of file
+}