diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 049a95f..6cbcccc 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -412,7 +412,7 @@
 		OPT_CMDMODE('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
 		OPT_CMDMODE(0, "textconv", &opt,
 			    N_("for blob objects, run textconv on object's content"), 'c'),
-		OPT_BOOL( 0, "allow-unknown-type", &unknown_type,
+		OPT_BOOL(0, "allow-unknown-type", &unknown_type,
 			  N_("allow -s and -t to work with broken/corrupt objects")),
 		{ OPTION_CALLBACK, 0, "batch", &batch, "format",
 			N_("show info and content of objects fed from the standard input"),