diff --git a/ChangeLog b/ChangeLog
index c36c5eb6..477bb18a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -9,6 +9,9 @@
 	(twittering-status-to-status-datum): Rename `regex-index' to
 	`regexp-index'.
 
+	* twittering-mode.el (debug-print): Reduce redundant calls of
+	`insert' because it can take multiple arguments.
+
 2010-02-07  Tadashi MATSUO  <tad@mymail.twin.jp>
 
 	* test/test-twittering-mode.el (test-format-status): replace the
diff --git a/twittering-mode.el b/twittering-mode.el
index 7b2fe85f..15cd3328 100644
--- a/twittering-mode.el
+++ b/twittering-mode.el
@@ -890,8 +890,7 @@ Return nil if SPEC-STR is invalid as a timeline spec."
     `(let ((,obsym ,obj))
        (if twittering-debug-mode
 	   (with-current-buffer (twittering-debug-buffer)
-	     (insert "[debug] ")
-	     (insert (prin1-to-string ,obsym))
+	     (insert "[debug] " (prin1-to-string ,obsym))
 	     (newline)
 	     ,obsym)
 	 ,obsym))))