diff --git a/tests/views/test_upgrades.py b/tests/views/test_upgrades.py
index 3b1821e..c41b43a 100644
--- a/tests/views/test_upgrades.py
+++ b/tests/views/test_upgrades.py
@@ -121,7 +121,7 @@ class TestUpgradeView(WebTestCase):
         model = self.app.model
         enum = self.app.enum
 
-        appdir = self.mkdir("app")
+        appdir = self.mkdtemp()
         self.config.setdefault("wutta.appdir", appdir)
         self.assertEqual(self.app.get_appdir(), appdir)
 
@@ -150,7 +150,7 @@ class TestUpgradeView(WebTestCase):
         model = self.app.model
         enum = self.app.enum
 
-        appdir = self.mkdir("app")
+        appdir = self.mkdtemp()
         self.config.setdefault("wutta.appdir", appdir)
         self.assertEqual(self.app.get_appdir(), appdir)
 
@@ -181,7 +181,7 @@ class TestUpgradeView(WebTestCase):
         model = self.app.model
         enum = self.app.enum
 
-        appdir = self.mkdir("app")
+        appdir = self.mkdtemp()
         self.config.setdefault("wutta.appdir", appdir)
         self.assertEqual(self.app.get_appdir(), appdir)
 
@@ -219,7 +219,7 @@ class TestUpgradeView(WebTestCase):
         model = self.app.model
         enum = self.app.enum
 
-        appdir = self.mkdir("app")
+        appdir = self.mkdtemp()
         self.config.setdefault("wutta.appdir", appdir)
         self.assertEqual(self.app.get_appdir(), appdir)