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-rw-r--r--lisp/emacs-lisp/cl-extra.el1
1 files changed, 1 insertions, 0 deletions
diff --git a/lisp/emacs-lisp/cl-extra.el b/lisp/emacs-lisp/cl-extra.el
index de5eb9c2d92..e1c8ebe2559 100644
--- a/lisp/emacs-lisp/cl-extra.el
+++ b/lisp/emacs-lisp/cl-extra.el
@@ -408,6 +408,7 @@ Other non-digit chars are considered junk.
RADIX is an integer between 2 and 36, the default is 10. Signal
an error if the substring between START and END cannot be parsed
as an integer unless JUNK-ALLOWED is non-nil."
+ (declare (side-effect-free t))
(cl-check-type string string)
(let* ((start (or start 0))
(len (length string))