diff --git a/doc/source/conf.py b/doc/source/conf.py
index a562440..c9ed61b 100755
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
diff --git a/os_api_ref/tests/examples/basic/conf.py b/os_api_ref/tests/examples/basic/conf.py
index f8d2212..997da6d 100644
--- a/os_api_ref/tests/examples/basic/conf.py
+++ b/os_api_ref/tests/examples/basic/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
diff --git a/os_api_ref/tests/examples/microversions/conf.py b/os_api_ref/tests/examples/microversions/conf.py
index d964432..e57a0fd 100644
--- a/os_api_ref/tests/examples/microversions/conf.py
+++ b/os_api_ref/tests/examples/microversions/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
diff --git a/os_api_ref/tests/examples/warnings/conf.py b/os_api_ref/tests/examples/warnings/conf.py
index f8d2212..997da6d 100644
--- a/os_api_ref/tests/examples/warnings/conf.py
+++ b/os_api_ref/tests/examples/warnings/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain