diff --git a/nixos/modules/system/boot/systemd/initrd.nix b/nixos/modules/system/boot/systemd/initrd.nix
index 370fceb94844..4f19ca1edf44 100644
--- a/nixos/modules/system/boot/systemd/initrd.nix
+++ b/nixos/modules/system/boot/systemd/initrd.nix
@@ -248,7 +248,7 @@ in
       '';
       example = literalExpression ''
         {
-          umount = ''${pkgs.util-linux}/bin/umount;
+          umount = "''${pkgs.util-linux}/bin/umount";
         }
       '';
       type = types.attrsOf types.path;