diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index 2d6748741a26e4f08e28872d79d846d06e07c6c7..ee43631f049be9f9e1aa6770750e3255fa812dc3 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -296,7 +296,6 @@ static int tomoyo_update_domain_keeper_entry(const char *domainname,
 	struct tomoyo_domain_keeper_entry *ptr;
 	const struct tomoyo_path_info *saved_domainname;
 	const struct tomoyo_path_info *saved_program = NULL;
-	static DEFINE_MUTEX(lock);
 	int error = -ENOMEM;
 	bool is_last_name = false;