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diff --git a/sys/net/iflib.c b/sys/net/iflib.c
--- a/sys/net/iflib.c
+++ b/sys/net/iflib.c
@@ -3457,6 +3457,13 @@
if_ctx_t ctx = txq->ift_ctx;
qidx_t dbval, max;
+ /*
+ * Nothing has been queued since the last doorbell. The threshold is
+ * zero for a lightly used ring, so the test below would not catch this.
+ */
+ if (txq->ift_db_pending == 0)
+ return (false);
+
max = TXQ_MAX_DB_DEFERRED(txq, txq->ift_in_use);
/* force || threshold exceeded || at the edge of the ring */

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