1 files changed, 2 insertions, 2 deletions

diff --git a/lisp/subr.el b/lisp/subr.el
index 9cf7d596cd9..74d4a7f427a 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -1456,8 +1456,8 @@ be a list of the form returned by `event-start' and `event-end'."
 (set-advertised-calling-convention 'unintern '(name obarray) "23.3")
 (set-advertised-calling-convention 'indirect-function '(object) "25.1")
 (set-advertised-calling-convention 'redirect-frame-focus '(frame focus-frame) "24.3")
-(set-advertised-calling-convention 'libxml-parse-xml-region '(start end base-url) "27.1")
-(set-advertised-calling-convention 'libxml-parse-html-region '(start end base-url) "27.1")
+(set-advertised-calling-convention 'libxml-parse-xml-region '(start end &optional base-url) "27.1")
+(set-advertised-calling-convention 'libxml-parse-html-region '(start end &optional base-url) "27.1")
 
 ;;;; Obsolescence declarations for variables, and aliases.