diff --git a/gvafile/osusers/tasks.py b/gvafile/osusers/tasks.py
index 65c8091..571046f 100644
--- a/gvafile/osusers/tasks.py
+++ b/gvafile/osusers/tasks.py
@@ -19,6 +19,10 @@ from gvafile.exceptions import GVAFileException
 
 _logger = get_task_logger(__name__)
 
+SUDO_CMD = '/usr/bin/sudo'
+INSTALL_CMD = '/usr/bin/install'
+SETFACL_CMD = '/usr/bin/setfacl'
+
 
 def _build_sftp_directory_name(username):
     """
@@ -53,11 +57,11 @@ def setup_file_sftp_userdir(username):
     sftp_directory = _build_sftp_directory_name(username)
     try:
         subprocess.check_output([
-            'sudo', 'install', '-o', username, '-g', username, '-m', '0750',
-            '-d', sftp_directory], stderr=subprocess.STDOUT)
+            SUDO_CMD, INSTALL_CMD, '-o', username, '-g', username,
+            '-m', '0750', '-d', sftp_directory], stderr=subprocess.STDOUT)
         subprocess.check_output([
-            'sudo' 'setfacl', '-r', '-m', 'www-data:--x', sftp_directory],
-            stderr=subprocess.STDOUT)
+            SUDO_CMD, SETFACL_CMD, '-r', '-m', 'www-data:--x',
+            sftp_directory], stderr=subprocess.STDOUT)
     except subprocess.CalledProcessError:
         _logger.exception(
             'could not create SFTP directory for user %s', username)