diff --git a/tests/lib/config.nix b/tests/lib/config.nix
index 6708f50..f13f15a 100644
--- a/tests/lib/config.nix
+++ b/tests/lib/config.nix
@@ -9,4 +9,13 @@
 
   # Enable second CPU core
   virtualisation.cores = lib.mkDefault 2;
+
+  # Don't make tests block on DNS requests that will never succeed
+  services.rspamd.locals."options.inc".text = ''
+    dns {
+      nameservers = ["127.0.0.1"];
+      timeout = 0.0s;
+      retransmits = 0;
+    }
+  '';
 }