diff --git a/tests/tools/test_vision_tools.py b/tests/tools/test_vision_tools.py
index c3021891a..e85372a5b 100644
--- a/tests/tools/test_vision_tools.py
+++ b/tests/tools/test_vision_tools.py
@@ -245,6 +245,7 @@ class TestErrorLoggingExcInfo:
              patch("tools.vision_tools._download_image", new_callable=AsyncMock,
                    side_effect=Exception("download boom")), \
              patch("tools.vision_tools._aux_async_client", new="fake"), \
+             patch("tools.vision_tools.DEFAULT_VISION_MODEL", new="test/model"), \
              caplog.at_level(logging.ERROR, logger="tools.vision_tools"):
 
             result = await vision_analyze_tool(