diff --git a/src/stratifier.c b/src/stratifier.c
index a039aad3..d6355d6f 100644
--- a/src/stratifier.c
+++ b/src/stratifier.c
@@ -429,6 +429,9 @@ struct stratifier_data {
 	/* Time we last sent out a stratum update */
 	time_t update_time;
 
+	/* Timestamp of last ZMQ block trigger for latency measurement */
+	tv_t zmq_trigger_time;
+
 	int64_t workbase_id;
 	int64_t blockchange_id;
 	int session_id;
@@ -1519,6 +1522,15 @@ retry:
 		stratum_broadcast_update(sdata, wb, new_block);
 	ret = true;
 	LOGINFO("Broadcast updated stratum base");
+	if (new_block && sdata->zmq_trigger_time.tv_sec) {
+		tv_t now;
+		tv_time(&now);
+		LOGWARNING("Block update latency: %dms (ZMQ trigger to mining.notify broadcast)",
+			   ms_tvdiff(&now, &sdata->zmq_trigger_time));
+	}
+	/* Always clear ZMQ trigger so a stale timestamp from a reconnection
+	 * or duplicate detection does not contaminate the next measurement. */
+	sdata->zmq_trigger_time.tv_sec = 0;
 	/* Update transactions after stratum broadcast to not delay
 	 * propagation. */
 	if (likely(txns))
@@ -8544,6 +8556,7 @@ static void *zmqnotify(void *arg)
 					LOGDEBUG("ZMQ sequence number");
 					break;
 				case 32:
+					tv_time(&sdata->zmq_trigger_time);
 					update_base(sdata, GEN_PRIORITY);
 					__bin2hex(hexhash, zmq_msg_data(&message), 32);
 					LOGNOTICE("ZMQ block hash %s", hexhash);