diff --git a/acceptance/tests/agent/fallback_to_cached_catalog.rb b/acceptance/tests/agent/fallback_to_cached_catalog.rb
index 68ca87b94..ae6b2024d 100644
--- a/acceptance/tests/agent/fallback_to_cached_catalog.rb
+++ b/acceptance/tests/agent/fallback_to_cached_catalog.rb
@@ -1,16 +1,18 @@
 test_name "fallback to the cached catalog"
 
 step "run agents once to cache the catalog" do
   with_puppet_running_on master, {} do
     on(agents, puppet("agent -t --server #{master}"))
   end
 end
 
 step "run agents again, verify they use cached catalog" do
   agents.each do |agent|
     # can't use --test, because that will set usecacheonfailure=false
-    on(agent, puppet("agent --onetime --no-daemonize --server #{master} --verbose")) do |result|
+    # We use a server that the agent can't possibly talk to in order
+    # to guarantee that no communication can take place.
+    on(agent, puppet("agent --onetime --no-daemonize --server puppet.example.com --verbose")) do |result|
       assert_match(/Using cached catalog/, result.stdout)
     end
   end
 end