diff --git a/nixos/tests/avahi.nix b/nixos/tests/avahi.nix
index ebb46838325f..c53a95903291 100644
--- a/nixos/tests/avahi.nix
+++ b/nixos/tests/avahi.nix
@@ -59,7 +59,7 @@ import ./make-test-python.nix {
     two.succeed("test `wc -l < out` -gt 0")
 
     # More DNS-SD.
-    one.execute('avahi-publish -s "This is a test" _test._tcp 123 one=1 &')
+    one.execute('avahi-publish -s "This is a test" _test._tcp 123 one=1 >&2 &')
     one.sleep(5)
     two.succeed("avahi-browse -r -t _test._tcp | tee out >&2")
     two.succeed("test `wc -l < out` -gt 0")