diff --git a/cpu-miner.c b/cpu-miner.c
index cf6d76c..f744211 100644
--- a/cpu-miner.c
+++ b/cpu-miner.c
@@ -1024,11 +1024,12 @@ static void *miner_thread(void *userdata)
 			if (work.data[19] >= end_nonce && !memcmp(work.data, g_work.data, 76))
 				stratum_gen_work(&stratum, &g_work);
 		} else {
+			int min_scantime = have_longpoll ? LP_SCANTIME : opt_scantime;
 			/* obtain new work from internal workio thread */
 			pthread_mutex_lock(&g_work_lock);
-			if (!have_stratum && (!have_longpoll ||
-					time(NULL) >= g_work_time + LP_SCANTIME*3/4 ||
-					work.data[19] >= end_nonce)) {
+			if (!have_stratum &&
+			    (time(NULL) - g_work_time >= min_scantime ||
+			     work.data[19] >= end_nonce)) {
 				if (unlikely(!get_work(mythr, &g_work))) {
 					applog(LOG_ERR, "work retrieval failed, exiting "
 						"mining thread %d", mythr->id);