1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index cd3b04de712..d75edbc84ef 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -1151,7 +1151,7 @@ delimiter."
        ((looking-at "<<")
         (cond
          ((and (ruby-expr-beg 'heredoc)
-               (looking-at "<<\\(-\\)?\\(\\([\"'`]\\)\\([^\n]+?\\)\\3\\|\\(?:\\sw\\|\\s_\\)+\\)"))
+               (looking-at "<<\\([-~]\\)?\\(\\([\"'`]\\)\\([^\n]+?\\)\\3\\|\\(?:\\sw\\|\\s_\\)+\\)"))
           (setq re (regexp-quote (or (match-string 4) (match-string 2))))
           (if (match-beginning 1) (setq re (concat "\\s *" re)))
           (let* ((id-end (goto-char (match-end 0)))