diff --git a/chatmaild/src/chatmaild/tests/mail-data/encrypted.eml b/chatmaild/src/chatmaild/tests/mail-data/encrypted.eml
index e1f4aaec..15de7ad9 100644
--- a/chatmaild/src/chatmaild/tests/mail-data/encrypted.eml
+++ b/chatmaild/src/chatmaild/tests/mail-data/encrypted.eml
@@ -1,6 +1,6 @@
 From: {from_addr}
 To: {to_addr}
-Subject: {replaced_subject}
+Subject: {subject}
 Date: Sun, 15 Oct 2023 16:43:21 +0000
 Message-ID: <Mr.UVyJWZmkCKM.hGzNc6glBE_@c2.testrun.org>
 In-Reply-To: <Mr.MvmCz-GQbi_.6FGRkhDf05c@c2.testrun.org>
diff --git a/chatmaild/src/chatmaild/tests/plugin.py b/chatmaild/src/chatmaild/tests/plugin.py
index 06fe9f7c..bd245c41 100644
--- a/chatmaild/src/chatmaild/tests/plugin.py
+++ b/chatmaild/src/chatmaild/tests/plugin.py
@@ -71,11 +71,11 @@ def maildata(request):
 
     assert datadir.exists(), datadir
 
-    def maildata(name, **kwargs):
+    def maildata(name, from_addr, to_addr, subject="..."):
         # Using `.read_bytes().decode()` instead of `.read_text()` to preserve newlines.
         data = datadir.joinpath(name).read_bytes().decode()
 
-        text = data.format(**kwargs)
+        text = data.format(from_addr=from_addr, to_addr=to_addr, subject=subject)
         return BytesParser(policy=policy.default).parsebytes(text.encode())
 
     return maildata
diff --git a/chatmaild/src/chatmaild/tests/test_filtermail.py b/chatmaild/src/chatmaild/tests/test_filtermail.py
index da4e4b99..049e09fb 100644
--- a/chatmaild/src/chatmaild/tests/test_filtermail.py
+++ b/chatmaild/src/chatmaild/tests/test_filtermail.py
@@ -59,7 +59,7 @@ def test_filtermail_encryption_detection(maildata):
             "encrypted.eml",
             from_addr="1@example.org",
             to_addr="2@example.org",
-            replaced_subject=subject,
+            subject=subject,
         )
         assert check_encrypted(msg)