diff --git a/fs/affs/super.c b/fs/affs/super.c
index e602619aed9de905ae6d1fcfb7a02a911dff0f5f..d1ad11a8a4a59c2d7de3e854cfeb8b28716be59d 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -241,6 +241,7 @@ parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved,
 			affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
 			break;
 		case Opt_prefix:
+			kfree(*prefix);
 			*prefix = match_strdup(&args[0]);
 			if (!*prefix)
 				return 0;