diff --git a/daemon/call.c b/daemon/call.c
index 7e5665856..fb77dfaae 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -538,7 +538,7 @@ void call_timer(void *ptr) {
 	unsigned int pt;
 	endpoint_t ep;
 	struct timeval tv_start;
-	long long run_diff;
+	long long run_diff_us;
 
 	// timers are run in a single thread, so no locking required here
 	static struct timeval last_run;
@@ -547,16 +547,12 @@ void call_timer(void *ptr) {
 	tv_start = rtpe_now;
 
 	// ready to start?
-	run_diff = timeval_diff(&tv_start, &last_run);
-	if (run_diff < interval)
+	run_diff_us = timeval_diff(&tv_start, &last_run);
+	if (run_diff_us < interval)
 		return;
 
 	last_run = tv_start;
 
-	// round up and make integer seconds
-	run_diff += 499999;
-	run_diff /= 1000000;
-
 	ZERO(hlp);
 	hlp.addr_sfd = g_hash_table_new(g_endpoint_hash, g_endpoint_eq);
 
@@ -564,7 +560,7 @@ void call_timer(void *ptr) {
 		call_timer_iterator(c, &hlp);
 	ITERATE_CALL_LIST_NEXT_END(c);
 
-	stats_counters_ax_calc_avg(&rtpe_stats, run_diff);
+	stats_counters_ax_calc_avg(&rtpe_stats, run_diff_us);
 
 	/* update statistics regarding requests per second */
 	update_requests_per_second_stats(&rtpe_totalstats_interval.offers_ps, atomic64_get(&rtpe_stats.intv.offers));
diff --git a/include/statistics.h b/include/statistics.h
index 994794bfb..889fbd89a 100644
--- a/include/statistics.h
+++ b/include/statistics.h
@@ -151,16 +151,16 @@ GQueue *statistics_gather_metrics(void);
 void statistics_free_metrics(GQueue **);
 const char *statistics_ng(bencode_item_t *input, bencode_item_t *output);
 
-INLINE void stats_counters_ax_calc_avg1(atomic64 *ax_var, atomic64 *intv_var, long long run_diff) {
+INLINE void stats_counters_ax_calc_avg1(atomic64 *ax_var, atomic64 *intv_var, long long run_diff_us) {
 	uint64_t tmp = atomic64_get_set(ax_var, 0);
-	atomic64_set(intv_var, tmp / run_diff);
+	atomic64_set(intv_var, tmp * 1000000LL / run_diff_us);
 }
 
-INLINE void stats_counters_ax_calc_avg(struct global_stats_ax *stats, long long run_diff) {
-	if (run_diff < 0)
-		run_diff = 1;
+INLINE void stats_counters_ax_calc_avg(struct global_stats_ax *stats, long long run_diff_us) {
+	if (run_diff_us <= 0)
+		return;
 
-#define F(x) stats_counters_ax_calc_avg1(&stats->ax.x, &stats->intv.x, run_diff);
+#define F(x) stats_counters_ax_calc_avg1(&stats->ax.x, &stats->intv.x, run_diff_us);
 #include "counter_stats_fields.inc"
 #undef F
 }