diff --git a/src/stat.cpp b/src/stat.cpp
index 573d5d5b2..d137ed1e0 100644
--- a/src/stat.cpp
+++ b/src/stat.cpp
@@ -41,9 +41,11 @@ namespace libtorrent {
 
 void stat_channel::second_tick(int tick_interval_ms)
 {
+	if (m_counter == 0) return;
+
 	int sample = int(size_type(m_counter) * 1000 / tick_interval_ms);
 	TORRENT_ASSERT(sample >= 0);
-	m_average = m_average * 4 / 3 + sample / 4;
+	m_average = m_average * 3 / 4 + sample / 4;
 	m_counter = 0;
 }