diff --git a/lenovo/thinkpad/z/gen2/z13/asound.conf b/lenovo/thinkpad/z/gen2/z13/asound.conf
new file mode 100644
index 0000000..e977df7
--- /dev/null
+++ b/lenovo/thinkpad/z/gen2/z13/asound.conf
@@ -0,0 +1,9 @@
+pcm.!default {
+	type plug
+	slave.pcm "hw:1,0"
+}
+
+ctl.!default {
+	type hw
+	card 1
+}
diff --git a/lenovo/thinkpad/z/gen2/z13/default.nix b/lenovo/thinkpad/z/gen2/z13/default.nix
index 5eb6ef0..636d2e0 100644
--- a/lenovo/thinkpad/z/gen2/z13/default.nix
+++ b/lenovo/thinkpad/z/gen2/z13/default.nix
@@ -5,15 +5,5 @@
     ../../../../../lenovo/thinkpad/z/gen2
   ];
 
-  sound.extraConfig = ''
-    pcm.!default {
-        type plug
-        slave.pcm "hw:1,0"
-    }
-
-    ctl.!default {
-        type hw
-        card 1
-    }
-  '';
+  environment.etc."asound.conf".source = ./asound.conf;
 }