diff --git a/modules/nixos/hardware/audio/default.nix b/modules/nixos/hardware/audio/default.nix
index f7fc383..864c7d2 100644
--- a/modules/nixos/hardware/audio/default.nix
+++ b/modules/nixos/hardware/audio/default.nix
@@ -15,11 +15,11 @@
     # Reduce latency
     # https://wiki.nixos.org/wiki/PipeWire#Low-latency_setup
     extraConfig = let
-      rate = 48000;
+      rate = builtins.toString 48000;
 
       # The default value in the wiki is 32 but might result in crackling audio.
       # If you get audio crackling try increasing this value until it's gone.
-      quantum = 32;
+      quantum = builtins.toString 32;
     in {
       pipewire."92-low-latency" = {
         "context.properties" = {