diff --git a/CHANGELOG.md b/CHANGELOG.md
index b65a3008ff..2f85f51263 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,7 @@
 * [BUGFIX] Strip path.rootfs from mountpoint labels #1421
 * [BUGFIX] Fix empty string in path.rootfs #1464
 * [BUGFIX] Fix typo in cpufreq metric names #1510
+* [BUGFIX] Fix network speed math #1580
 
 ## 0.18.1 / 2019-06-04
 
diff --git a/collector/netclass_linux.go b/collector/netclass_linux.go
index 8d8a984e11..cbfcb6286a 100644
--- a/collector/netclass_linux.go
+++ b/collector/netclass_linux.go
@@ -144,7 +144,7 @@ func (c *netClassCollector) Update(ch chan<- prometheus.Metric) error {
 		}
 
 		if ifaceInfo.Speed != nil {
-			speedBytes := int64(*ifaceInfo.Speed / 8 * 1000 * 1000)
+			speedBytes := int64(*ifaceInfo.Speed * 1000 * 1000 / 8)
 			pushMetric(ch, c.subsystem, "speed_bytes", speedBytes, ifaceInfo.Name, prometheus.GaugeValue)
 		}