diff --git a/modules/installer/cd-dvd/iso-image.nix b/modules/installer/cd-dvd/iso-image.nix
index 76b4803ccec0..7e02b6ac2cc7 100644
--- a/modules/installer/cd-dvd/iso-image.nix
+++ b/modules/installer/cd-dvd/iso-image.nix
@@ -196,7 +196,7 @@ in
 
   boot.initrd.kernelModules = [ "loop" ];
 
-  boot.kernelModules = pkgs.stdenv.lib.optional config.isoImage.makeEfiBootable "efivars":
+  boot.kernelModules = pkgs.stdenv.lib.optional config.isoImage.makeEfiBootable "efivars";
 
   # In stage 1, mount a tmpfs on top of / (the ISO image) and
   # /nix/store (the squashfs image) to make this a live CD.