diff --git a/sys/dev/cxgbe/t4_main.c b/sys/dev/cxgbe/t4_main.c
index 39dc816b5aee..4e968a957616 100644
--- a/sys/dev/cxgbe/t4_main.c
+++ b/sys/dev/cxgbe/t4_main.c
@@ -5258,8 +5258,7 @@ sysctl_qsize_txq(SYSCTL_HANDLER_ARGS)
 	if (rc != 0 || req->newptr == NULL)
 		return (rc);
 
-	/* bufring size must be powerof2 */
-	if (qsize < 128 || !powerof2(qsize))
+	if (qsize < 128 || qsize > 65536)
 		return (EINVAL);
 
 	rc = begin_synchronized_op(sc, pi, HOLD_LOCK | SLEEP_OK | INTR_OK,