diff --git a/nix/configuration/hosts/quark/default.nix b/nix/configuration/hosts/quark/default.nix
index 663151e..2ed3290 100644
--- a/nix/configuration/hosts/quark/default.nix
+++ b/nix/configuration/hosts/quark/default.nix
@@ -26,7 +26,7 @@
 
     me.optimizations = {
       enable = true;
-      arch = "znver5";
+      arch = "znver4"; # build breaks on znver5 currently.
       system_features = [
         "gccarch-znver4"
         "gccarch-znver5"