1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index 5d59a56e858..026616e68f4 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -709,7 +709,7 @@ It is used when `ruby-encoding-magic-comment-style' is set to `custom'."
         (if prefix
             (setq name
                   (cond
-                   ((string-match "^self\." name)
+                   ((string-match "^self\\." name)
                     (concat (substring prefix 0 -1) (substring name 4)))
                   (t (concat prefix name)))))
         (push (cons name pos) index-alist)