diff --git a/swift/common/utils/__init__.py b/swift/common/utils/__init__.py
index 16dc58807a..13ec9443ab 100644
--- a/swift/common/utils/__init__.py
+++ b/swift/common/utils/__init__.py
@@ -2542,6 +2542,7 @@ def readconf(conf_path, section_name=None, log_name=None, defaults=None,
             # values like "1%" (which we want to support for
             # fallocate_reserve).
             c = ConfigParser(defaults, interpolation=NicerInterpolation())
+    c.optionxform = str  # Don't lower-case keys
 
     if hasattr(conf_path, 'readline'):
         if hasattr(conf_path, 'seek'):
diff --git a/test/unit/common/test_daemon.py b/test/unit/common/test_daemon.py
index 94c7917bcd..9dc190e5cf 100644
--- a/test/unit/common/test_daemon.py
+++ b/test/unit/common/test_daemon.py
@@ -226,7 +226,8 @@ class TestRunDaemon(unittest.TestCase, ConfigAssertMixin):
             d = daemon.run_daemon(MyDaemon, conf_path)
         # my-daemon section takes priority (!?)
         self.assertEqual('2', d.conf['client_timeout'])
-        self.assertEqual('10', d.conf['conn_timeout'])
+        self.assertEqual('10', d.conf['CONN_timeout'])
+        self.assertEqual('5', d.conf['conn_timeout'])
 
     @with_tempdir
     def test_run_daemon_from_conf_file_with_duplicate_var(self, tempdir):
@@ -237,13 +238,16 @@ class TestRunDaemon(unittest.TestCase, ConfigAssertMixin):
         [my-daemon]
         CLIENT_TIMEOUT = 2
         client_timeout = 1
+        conn_timeout = 1.1
+        conn_timeout = 1.2
         """
         contents = dedent(conf_body)
         with open(conf_path, 'w') as f:
             f.write(contents)
         with mock.patch('swift.common.daemon.use_hub'):
             app_config = lambda: daemon.run_daemon(MyDaemon, tempdir)
-            self.assertDuplicateOption(app_config, 'client_timeout', '1')
+            # N.B. CLIENT_TIMEOUT/client_timeout are unique options
+            self.assertDuplicateOption(app_config, 'conn_timeout', '1.2')
 
     @with_tempdir
     def test_run_deamon_from_conf_dir(self, tempdir):
@@ -270,7 +274,8 @@ class TestRunDaemon(unittest.TestCase, ConfigAssertMixin):
             d = daemon.run_daemon(MyDaemon, tempdir)
         # my-daemon section takes priority (!?)
         self.assertEqual('2', d.conf['client_timeout'])
-        self.assertEqual('10', d.conf['conn_timeout'])
+        self.assertEqual('10', d.conf['CONN_timeout'])
+        self.assertEqual('5', d.conf['conn_timeout'])
 
     @with_tempdir
     def test_run_daemon_from_conf_dir_with_duplicate_var(self, tempdir):
@@ -283,6 +288,8 @@ class TestRunDaemon(unittest.TestCase, ConfigAssertMixin):
             [my-daemon]
             client_timeout = 2
             CLIENT_TIMEOUT = 4
+            conn_timeout = 1.1
+            conn_timeout = 1.2
             """,
         }
         for filename, conf_body in conf_files.items():
@@ -291,7 +298,8 @@ class TestRunDaemon(unittest.TestCase, ConfigAssertMixin):
                 fd.write(dedent(conf_body))
         with mock.patch('swift.common.daemon.use_hub'):
             app_config = lambda: daemon.run_daemon(MyDaemon, tempdir)
-            self.assertDuplicateOption(app_config, 'client_timeout', '4')
+            # N.B. CLIENT_TIMEOUT/client_timeout are unique options
+            self.assertDuplicateOption(app_config, 'conn_timeout', '1.2')
 
     @contextmanager
     def mock_os(self, child_worker_cycles=3):
diff --git a/test/unit/common/test_wsgi.py b/test/unit/common/test_wsgi.py
index 39349ffa3f..b6a384354b 100644
--- a/test/unit/common/test_wsgi.py
+++ b/test/unit/common/test_wsgi.py
@@ -148,6 +148,8 @@ class TestWSGI(unittest.TestCase, ConfigAssertMixin):
         app = wsgi.loadapp(conf_path)
         self.assertIsInstance(app, obj_server.ObjectController)
         self.assertTrue(isinstance(app, obj_server.ObjectController))
+        # N.B. paste config loading from *file* is already case-sensitive,
+        # so, CLIENT_TIMEOUT/client_timeout are unique options
         self.assertEqual(1, app.client_timeout)
         self.assertEqual(5, app.conn_timeout)
 
@@ -298,6 +300,8 @@ class TestWSGI(unittest.TestCase, ConfigAssertMixin):
             use = egg:swift#proxy
             client_timeout = 2
             CLIENT_TIMEOUT = 1
+            conn_timeout = 3
+            conn_timeout = 4
             """,
         }
         _fake_rings(tempdir)
@@ -306,7 +310,9 @@ class TestWSGI(unittest.TestCase, ConfigAssertMixin):
             with open(path, 'wt') as fd:
                 fd.write(dedent(conf_body))
         app_config = lambda: wsgi.loadapp(tempdir)
-        self.assertDuplicateOption(app_config, 'client_timeout', 2.0)
+        # N.B. our paste conf.d parsing re-uses readconf,
+        # so, CLIENT_TIMEOUT/client_timeout are unique options
+        self.assertDuplicateOption(app_config, 'conn_timeout', 4.0)
 
     @with_tempdir
     def test_load_app_config(self, tempdir):