diff --git a/src/paperless_mail/tests/test_mail.py b/src/paperless_mail/tests/test_mail.py
index 77db096c4..0104f5023 100644
--- a/src/paperless_mail/tests/test_mail.py
+++ b/src/paperless_mail/tests/test_mail.py
@@ -41,7 +41,7 @@ def login(self, username, password):
 
     folder = BogusFolderManager()
 
-    def fetch(self, criteria, mark_seen):
+    def fetch(self, criteria, mark_seen, charset=""):
         msg = self.messages
 
         criteria = str(criteria).strip('()').split(" ")