diff --git a/lisp/vc/vc.el b/lisp/vc/vc.el
index f1d0fba0e26..cb6197c62b7 100644
--- a/lisp/vc/vc.el
+++ b/lisp/vc/vc.el
@@ -1479,7 +1479,7 @@ itself responsible for the file (usually because other files in that
 directory are already registered under that backend) will be used to
 register the file.  If no backend declares itself responsible, the
 first backend that could register the file is used."
-  (interactive "P")
+  (interactive)
   (let* ((fileset-arg (or vc-fileset (vc-deduce-fileset nil t)))
          (backend (car fileset-arg))
 	 (files (nth 1 fileset-arg)))