diff --git a/raspberry-pi/4/audio.nix b/raspberry-pi/4/audio.nix
index 9bccfda..3877386 100644
--- a/raspberry-pi/4/audio.nix
+++ b/raspberry-pi/4/audio.nix
@@ -38,9 +38,9 @@ in
 
     # set tsched=0 in pulseaudio config to avoid audio glitches
     # see https://wiki.archlinux.org/title/PulseAudio/Troubleshooting#Glitches,_skips_or_crackling
-    hardware.pulseaudio.configFile = lib.mkDefault pkgs.runCommand "default.pa" {} ''
+    hardware.pulseaudio.configFile = lib.mkOverride 990 (pkgs.runCommand "default.pa" {} ''
       sed 's/module-udev-detect$/module-udev-detect tsched=0/' ${config.hardware.pulseaudio.package}/etc/pulse/default.pa > $out
-    '';
+    '');
   };
 }