diff --git a/CHANGELOG.md b/CHANGELOG.md
index e02195fc..7c997430 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,7 @@ Darwin meminfo metrics have been renamed to match Prometheus conventions. #1060
 * [BUGFIX] Handle vanishing PIDs #1043
 * [BUGFIX] Correctly cast Darwin memory info #1060
 * [BUGFIX] Filter systemd units in Go for compatibility with older versions #1083
+* [BUGFIX] Update cpu collector for OpenBSD 6.4
 
 ## 0.16.0 / 2018-05-15
 
diff --git a/collector/cpu_openbsd.go b/collector/cpu_openbsd.go
index e9b102fe..996e50ec 100644
--- a/collector/cpu_openbsd.go
+++ b/collector/cpu_openbsd.go
@@ -59,10 +59,12 @@ func (c *cpuCollector) Update(ch chan<- prometheus.Metric) (err error) {
 	var cp_time [][C.CPUSTATES]C.int64_t
 	for i := 0; i < int(ncpus); i++ {
 		cp_timeb, err := unix.SysctlRaw("kern.cp_time2", i)
-		if err != nil {
+		if err != nil && err != unix.ENODEV {
 			return err
 		}
-		cp_time = append(cp_time, *(*[C.CPUSTATES]C.int64_t)(unsafe.Pointer(&cp_timeb[0])))
+		if err != unix.ENODEV {
+			cp_time = append(cp_time, *(*[C.CPUSTATES]C.int64_t)(unsafe.Pointer(&cp_timeb[0])))
+		}
 	}
 
 	for cpu, time := range cp_time {