1 files changed, 5 insertions, 2 deletions

diff --git a/lisp/emacs-lisp/byte-opt.el b/lisp/emacs-lisp/byte-opt.el
index 90154728f34..cbfc5c7d800 100644
--- a/lisp/emacs-lisp/byte-opt.el
+++ b/lisp/emacs-lisp/byte-opt.el
@@ -279,10 +279,13 @@
       (if (symbolp fn)
           (byte-compile-inline-expand (cons fn (cdr form)))
         (if (byte-code-function-p fn)
-            (progn
+            (let (string)
               (fetch-bytecode fn)
+              (setq string (aref fn 1))
+              (if (fboundp 'string-as-unibyte)
+                  (setq string (string-as-unibyte string)))
               (cons (list 'lambda (aref fn 0)
-                          (list 'byte-code (aref fn 1) (aref fn 2) (aref fn 3)))
+                          (list 'byte-code string (aref fn 2) (aref fn 3)))
                     (cdr form)))
           (if (not (eq (car fn) 'lambda)) (error "%s is not a lambda" name))
           (cons fn (cdr form)))))))