diff --git a/lisp/gnus/nnnil.el b/lisp/gnus/nnnil.el
index 36a8bc4581b..092b53298a2 100644
--- a/lisp/gnus/nnnil.el
+++ b/lisp/gnus/nnnil.el
@@ -40,7 +40,7 @@
 (defun nnnil-open-server (_server &optional _definitions)
   t)
 
-(defun nnnil-close-server (&optional _server)
+(defun nnnil-close-server (&optional _server _defs)
   t)
 
 (defun nnnil-request-close ()