diff --git a/lisp/vc/vc-hg.el b/lisp/vc/vc-hg.el
index f4a44df3c2..d5740b6e21 100644
--- a/lisp/vc/vc-hg.el
+++ b/lisp/vc/vc-hg.el
@@ -1185,19 +1185,33 @@ vc-hg-log-edit-mode
   "Major mode for editing Hg log messages.
 It is based on `log-edit-mode', and has Hg-specific extensions.")
 
+(defvar vc-hg-patch-string nil)
+
 (defun vc-hg-checkin (files comment &optional _rev)
   "Hg-specific version of `vc-backend-checkin'.
 REV is ignored."
-  (let ((amend-extract-fn
-         (lambda (value)
-           (when (equal value "yes")
-             (list "--amend")))))
-    (apply #'vc-hg-command nil 0 files
-           (nconc (list "commit" "-m")
-                  (log-edit-extract-headers `(("Author" . "--user")
-                                              ("Date" . "--date")
-                                              ("Amend" . ,amend-extract-fn))
-                                            comment)))))
+  (apply #'vc-hg-command nil 0 files
+         (nconc (list "commit"
+                      "-m")
+                (vc-hg--extract-headers comment))))
+
+(defun vc-hg-checkin-patch (patch-string comment)
+  (let ((patch-file (make-temp-file "hg-patch")))
+    (with-temp-file patch-file
+      (insert patch-string))
+    (unwind-protect
+        (apply #'vc-hg-command nil 0 nil
+               (nconc (list "import" "--bypass" patch-file "-m")
+                      (vc-hg--extract-headers comment)))
+      (delete-file patch-file))))
+
+(defun vc-hg--extract-headers (comment)
+  (log-edit-extract-headers `(("Author" . "--user")
+                              ("Date" . "--date")
+                              ("Amend" . (lambda (value)
+                                           (when (equal value "yes")
+                                             (list "--amend")))))
+                            comment))
 
 (defun vc-hg-find-revision (file rev buffer)
   (let ((coding-system-for-read 'binary)