diff --git a/builtin/grep.c b/builtin/grep.c
index abc440023f..d04f4400d9 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -738,7 +738,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 			PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
 		OPT_BOOL(0, "ext-grep", &external_grep_allowed__ignored,
 			 N_("allow calling of grep(1) (ignored by this build)")),
-		{ OPTION_CALLBACK, 0, "help-all", &options, NULL, N_("show usage"),
+		{ OPTION_CALLBACK, 0, "help-all", NULL, NULL, N_("show usage"),
 		  PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
 		OPT_END()
 	};