diff --git a/lisp/progmodes/cc-cmds.el b/lisp/progmodes/cc-cmds.el
index 1c51a4b6fd2..cb88f344cc0 100644
--- a/lisp/progmodes/cc-cmds.el
+++ b/lisp/progmodes/cc-cmds.el
@@ -4202,8 +4202,7 @@ Warning: Regexp from `c-comment-prefix-regexp' doesn't match the comment prefix
 	  (forward-char (- hang-ender-stuck))
 	  (if (or fill-paragraph (not auto-fill-spaces))
 	      (insert-char ?\  hang-ender-stuck t)
-	    (insert auto-fill-spaces)
-	    (setq here (- here (- hang-ender-stuck (length auto-fill-spaces)))))
+	    (insert auto-fill-spaces))
 	  (delete-char hang-ender-stuck)
 	  (goto-char here))
 	(set-marker tmp-post nil))