diff --git a/testing_support/gerrit_test_case.py b/testing_support/gerrit_test_case.py
index 9d5f643f3..65c573b42 100644
--- a/testing_support/gerrit_test_case.py
+++ b/testing_support/gerrit_test_case.py
@@ -155,7 +155,7 @@ class GerritTestCase(unittest.TestCase):
     """Sets up the gerrit instances in a class-specific temp dir."""
     # Create gerrit instance.
     gerrit_dir = tempfile.mkdtemp()
-    os.chmod(gerrit_dir, 0o0700)
+    os.chmod(gerrit_dir, 0o700)
     gi = cls.gerrit_instance = cls._create_gerrit_instance(gerrit_dir)
 
     # Set netrc file for http authentication.
@@ -188,7 +188,7 @@ class GerritTestCase(unittest.TestCase):
 
   def setUp(self):
     self.tempdir = tempfile.mkdtemp()
-    os.chmod(self.tempdir, 0o0700)
+    os.chmod(self.tempdir, 0o700)
 
   def tearDown(self):
     if TEARDOWN:
diff --git a/testing_support/git_test_utils.py b/testing_support/git_test_utils.py
index a00938e7d..1e7065a22 100644
--- a/testing_support/git_test_utils.py
+++ b/testing_support/git_test_utils.py
@@ -240,7 +240,7 @@ class GitRepo(object):
       SPECIAL_KEY: special_value,
       ...
       "path/to/some/file": { 'data': "some data content for this file",
-                              'mode': 0o0755 },
+                              'mode': 0o755 },
       ...
     }
 
diff --git a/tests/git_common_test.py b/tests/git_common_test.py
index 00f5ca4d7..5a16fa31b 100755
--- a/tests/git_common_test.py
+++ b/tests/git_common_test.py
@@ -175,7 +175,7 @@ class GitReadOnlyFunctionsTest(git_test_utils.GitRepoReadOnlyTestBase,
 
   COMMIT_C = {
     'some/files/file2': {
-      'mode': 0o0755,
+      'mode': 0o755,
       'data': 'file2 - vanilla\n'},
   }
 
@@ -750,7 +750,7 @@ class GitFreezeThaw(git_test_utils.GitRepoReadWriteTestBase):
 
   COMMIT_C = {
     'some/files/file2': {
-      'mode': 0o0755,
+      'mode': 0o755,
       'data': 'file2 - vanilla'},
   }
 
diff --git a/tests/git_hyper_blame_test.py b/tests/git_hyper_blame_test.py
index d14d4b684..f690e567a 100755
--- a/tests/git_hyper_blame_test.py
+++ b/tests/git_hyper_blame_test.py
@@ -232,7 +232,7 @@ class GitHyperBlameSimpleTest(GitHyperBlameTestBase):
 
   COMMIT_B = {
     'some/files/file2': {
-      'mode': 0o0755,
+      'mode': 0o755,
       'data': 'file2 - vanilla\n'},
     'some/files/empty': {'data': 'not anymore'},
     'some/files/file3': {'data': 'file3'},
diff --git a/third_party/upload.py b/third_party/upload.py
index baeb214e8..261485a33 100755
--- a/third_party/upload.py
+++ b/third_party/upload.py
@@ -528,10 +528,10 @@ class HttpRpcServer(AbstractRpcServer):
           pass
       else:
         # Create an empty cookie file with mode 600
-        fd = os.open(self.cookie_file, os.O_CREAT, 0o0600)
+        fd = os.open(self.cookie_file, os.O_CREAT, 0o600)
         os.close(fd)
       # Always chmod the cookie file
-      os.chmod(self.cookie_file, 0o0600)
+      os.chmod(self.cookie_file, 0o600)
     else:
       # Don't save cookies across runs of update.py.
       self.cookie_jar = cookielib.CookieJar()