diff --git a/ChangeLog b/ChangeLog
index c9fe7c14..21678840 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,6 +4,9 @@
 	wide characters.
 	(twittering-favorite): Likewise.
 
+	* twittering-mode.el (twittering-extract-timeline-spec): Delete an
+	unused argument to `error'.
+
 2010-02-18  Tadashi MATSUO  <tad@mymail.twin.jp>
 
 	* twittering-mode.el (twittering-current-timeline-spec): return
diff --git a/twittering-mode.el b/twittering-mode.el
index 782058bd..62893f55 100644
--- a/twittering-mode.el
+++ b/twittering-mode.el
@@ -699,7 +699,7 @@ If SHORTEN is non-nil, the abbreviated expression will be used."
 Return cons of the spec and the rest string."
   (cond
    ((null str)
-    (error "STR is nil" str)
+    (error "STR is nil")
     nil)
    ((string-match "^\\([a-zA-Z0-9_-]+\\)/\\([a-zA-Z0-9_-]+\\)" str)
     (let ((user (match-string 1 str))