diff --git a/tag.h b/tag.h
index 7a0cb0070d..c437890f79 100644
--- a/tag.h
+++ b/tag.h
@@ -9,7 +9,6 @@ struct tag {
 	struct object object;
 	struct object *tagged;
 	char *tag;
-	char *signature; /* not actually implemented */
 };
 
 extern struct tag *lookup_tag(const unsigned char *sha1);