diff --git a/lib/galaxy/config/__init__.py b/lib/galaxy/config/__init__.py
index 96c2a63023e..8a8d0fc9f5a 100644
--- a/lib/galaxy/config/__init__.py
+++ b/lib/galaxy/config/__init__.py
@@ -707,6 +707,7 @@ class GalaxyAppConfiguration(BaseAppConfiguration, CommonConfigurationMixin):
 
     def _override_tempdir(self, kwargs):
         if string_as_bool(kwargs.get("override_tempdir", "True")):
+            raise Exception("How did we get here ?")
             tempfile.tempdir = self.new_file_path
 
     def config_value_for_host(self, config_option, host):
diff --git a/test/unit/webapps/test_config_values.py b/test/unit/webapps/test_config_values.py
index bd2e1fe0631..24f922cee46 100644
--- a/test/unit/webapps/test_config_values.py
+++ b/test/unit/webapps/test_config_values.py
@@ -18,10 +18,6 @@ def appconfig():
 
 @pytest.fixture
 def mock_config_file(monkeypatch):
-    # Patch this; otherwise tempfile.tempdir will be set, which is a global variable that
-    # defines the value of the default `dir` argument to the functions in Python's
-    # tempfile module - which breaks multiple tests.
-    monkeypatch.setattr(config.GalaxyAppConfiguration, '_override_tempdir', lambda a, b: None)
     # Set this to return None to force the creation of base config directories
     # in _set_config_directories(). Used to test the values of these directories only.
     monkeypatch.setattr(config, 'find_config_file', lambda x: None)