diff --git a/lenovo/thinkpad/t430/default.nix b/lenovo/thinkpad/t430/default.nix
index bdad1be..9c5580e 100644
--- a/lenovo/thinkpad/t430/default.nix
+++ b/lenovo/thinkpad/t430/default.nix
@@ -10,7 +10,7 @@
   boot = {
     kernelParams = [
       # fixes brightness keys, see https://wiki.archlinux.org/index.php/Lenovo_ThinkPad_T430s
-      "acpi_osi\='!Windows 2012'"
+      ''acpi_osi="!Windows 2012"''
     ];
   };
 }