diff --git a/lisp/gnus/nnsoup.el b/lisp/gnus/nnsoup.el
index e7641509a84..d228d1698f9 100644
--- a/lisp/gnus/nnsoup.el
+++ b/lisp/gnus/nnsoup.el
@@ -38,7 +38,7 @@
 (defvoo nnsoup-directory "~/SOUP/"
   "*SOUP packet directory.")
 
-(defvoo nnsoup-tmp-directory "/tmp/"
+(defvoo nnsoup-tmp-directory temporary-file-directory
   "*Where nnsoup will store temporary files.")
 
 (defvoo nnsoup-replies-directory (concat nnsoup-directory "replies/")