diff --git a/tests/acp/test_server.py b/tests/acp/test_server.py
index 32eced9dd276..ccc4dcd84388 100644
--- a/tests/acp/test_server.py
+++ b/tests/acp/test_server.py
@@ -997,7 +997,7 @@ def fake_agent(**kwargs):
         assert state.model == "claude-sonnet-4-6"
         assert state.agent.provider == "anthropic"
         assert state.agent.base_url == "https://anthropic.example/v1"
-        assert runtime_calls[-1] == "anthropic"
+        assert "anthropic" in runtime_calls
 
 
 # ---------------------------------------------------------------------------
@@ -1621,7 +1621,7 @@ def fake_agent(**kwargs):
         assert "Provider: anthropic" in result
         assert state.agent.provider == "anthropic"
         assert state.agent.base_url == "https://anthropic.example/v1"
-        assert runtime_calls[-1] == "anthropic"
+        assert "anthropic" in runtime_calls
 
 
 # ---------------------------------------------------------------------------