diff --git a/modules/programs/getmail.nix b/modules/programs/getmail.nix
index f83c469ff..eaf297cf2 100644
--- a/modules/programs/getmail.nix
+++ b/modules/programs/getmail.nix
@@ -11,8 +11,7 @@ let
     with account;
     let
       passCmd = concatMapStringsSep ", " (x: "'${x}'") passwordCommand;
-      renderedMailboxes =
-        concatMapStringsSep ", " (x: "'${x}'") getmail.mailboxes;
+      renderedMailboxes = concatMapStrings (x: "'${x}', ") getmail.mailboxes;
       retrieverType = if imap.tls.enable then
         "SimpleIMAPSSLRetriever"
       else
diff --git a/tests/modules/programs/getmail/getmail-expected.conf b/tests/modules/programs/getmail/getmail-expected.conf
index 90dc963e5..a91522a5d 100644
--- a/tests/modules/programs/getmail/getmail-expected.conf
+++ b/tests/modules/programs/getmail/getmail-expected.conf
@@ -5,7 +5,7 @@ server = imap.example.com
 port = 993
 username = home.manager
 password_command = ('password-command')
-mailboxes = ( 'INBOX', 'Sent', 'Work' )
+mailboxes = ( 'INBOX', 'Sent', 'Work',  )
 
 [destination]
 type = MDA_external