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diff --git a/doc/build.py b/doc/build.py
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index 73426713..af3313d1 100755
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--- a/doc/build.py
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+++ b/doc/build.py
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@@ -7,16 +7,6 @@ from subprocess import check_call, check_output, CalledProcessError, Popen, PIPE
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 versions = ['1.0.0', '1.1.0', '2.0.0', '3.0.2', '4.0.0', '4.1.0', '5.0.0', '5.1.0', '5.2.0', '5.2.1', '5.3.0', '6.0.0', '6.1.0', '6.1.1', '6.1.2', '6.2.0', '6.2.1']
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-def create_build_env(dirname='virtualenv'):
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-  # Create virtualenv.
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-  if not os.path.exists(dirname):
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-    check_call(['virtualenv', dirname])
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-  import sysconfig
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-  scripts_dir = os.path.basename(sysconfig.get_path('scripts'))
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-  activate_this_file = os.path.join(dirname, scripts_dir, 'activate_this.py')
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-  with open(activate_this_file) as f:
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-    exec(f.read(), dict(__file__=activate_this_file))
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-
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 def build_docs(version='dev', **kwargs):
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   doc_dir = kwargs.get('doc_dir', os.path.dirname(os.path.realpath(__file__)))
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   work_dir = kwargs.get('work_dir', '.')
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@@ -78,5 +68,4 @@ def build_docs(version='dev', **kwargs):
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   return html_dir
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 if __name__ == '__main__':
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-  create_build_env()
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   build_docs(sys.argv[1])
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-- 
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2.26.2
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