diff --git a/management/mailconfig.py b/management/mailconfig.py
index 054b3b0f..4024aaaf 100755
--- a/management/mailconfig.py
+++ b/management/mailconfig.py
@@ -148,7 +148,7 @@ def get_mail_users_ex(env, with_archived=False):
 		percent = ''
 		try:
 			dirsize_file = os.path.join(env['STORAGE_ROOT'], 'mail/mailboxes/{}/{}/maildirsize'.format(domain, user))
-			with open(dirsize_file, 'r', encoding="utf-8") as f:
+			with open(dirsize_file, encoding="utf-8") as f:
 				box_quota = int(f.readline().split('S')[0])
 				for line in f.readlines():
 					(size, count) = line.split(' ')
diff --git a/tools/readable_bash.py b/tools/readable_bash.py
index 4c79665c..75a535e2 100644
--- a/tools/readable_bash.py
+++ b/tools/readable_bash.py
@@ -124,7 +124,7 @@ def generate_documentation():
  """)
 
 	parser = Source.parser()
-	with open("setup/start.sh", "r", encoding="utf-8") as start_file:
+	with open("setup/start.sh", encoding="utf-8") as start_file:
 		for line in start_file:
 			try:
 				fn = parser.parse_string(line).filename()
@@ -401,7 +401,7 @@ class BashScript(Grammar):
 	@staticmethod
 	def parse(fn):
 		if fn in ("setup/functions.sh", "/etc/mailinabox.conf"): return ""
-		with open(fn, "r", encoding="utf-8") as f:
+		with open(fn, encoding="utf-8") as f:
 			string = f.read()
 
 		# tokenize