1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/textmodes/fill.el b/lisp/textmodes/fill.el
index 111cc10ab35..f58a2bb53cc 100644
--- a/lisp/textmodes/fill.el
+++ b/lisp/textmodes/fill.el
@@ -807,7 +807,7 @@ can take care of filling.  JUSTIFY is used as in `fill-paragraph'."
                              (looking-at comment-re)))
                  ;; We may have gone too far.  Go forward again.
                  (line-beginning-position
-                  (if (looking-at (concat ".*" comment-start-skip))
+                  (if (looking-at (concat ".*\\(?:" comment-start-skip "\\)"))
                       1 2))))
            ;; Find the beginning of the first line past the region to fill.
            (save-excursion