diff --git a/nixos/common/nix.nix b/nixos/common/nix.nix
index e83cd4b..54d4a86 100644
--- a/nixos/common/nix.nix
+++ b/nixos/common/nix.nix
@@ -22,6 +22,11 @@
   nix.daemonIOSchedClass = lib.mkDefault "idle";
   nix.daemonIOSchedPriority = lib.mkDefault 7;
 
+  # Make builds to be more likely killed than important services.
+  # 100 is the default for user slices and 500 is systemd-coredumpd@
+  # We rather want a build to be killed than our precious user sessions as builds can be easily restarted.
+  systemd.services.nix-daemon.OOMScoreAdjust = lib.mkDefault 250;
+
   # Avoid copying unnecessary stuff over SSH
   nix.settings.builders-use-substitutes = true;
 }