diff --git a/sbin/hastd/parse.y b/sbin/hastd/parse.y
index 3a80e2655f8b..b90ef5188574 100644
--- a/sbin/hastd/parse.y
+++ b/sbin/hastd/parse.y
@@ -370,7 +370,7 @@ yy_config_free(struct hastd_config *config)
 %}
 
 %token CONTROL PIDFILE LISTEN REPLICATION CHECKSUM COMPRESSION METAFLUSH
-%token TIMEOUT EXEC EXTENTSIZE RESOURCE NAME LOCAL REMOTE SOURCE ON OFF
+%token TIMEOUT EXEC RESOURCE NAME LOCAL REMOTE SOURCE ON OFF
 %token FULLSYNC MEMSYNC ASYNC NONE CRC32 SHA256 HOLE LZF
 %token NUM STR OB CB