diff --git a/collector/cpu_openbsd.go b/collector/cpu_openbsd.go
index f025c08f..15749872 100644
--- a/collector/cpu_openbsd.go
+++ b/collector/cpu_openbsd.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Prometheus Authors
+// Copyright 2020 The Prometheus Authors
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -11,8 +11,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build openbsd && !amd64 && !nocpu
-// +build openbsd,!amd64,!nocpu
+//go:build !nocpu
+// +build !nocpu
 
 package collector
 
@@ -25,11 +25,31 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-/*
-#include <sys/param.h>
-#include <sys/sched.h>
-*/
-import "C"
+type clockinfo struct {
+	hz      int32
+	tick    int32
+	tickadj int32
+	stathz  int32
+	profhz  int32
+}
+
+const (
+	CP_USER = iota
+	CP_NICE
+	CP_SYS
+	CP_SPIN
+	CP_INTR
+	CP_IDLE
+	CPUSTATES
+)
+const (
+	CP_USER_O63 = iota
+	CP_NICE_O63
+	CP_SYS_O63
+	CP_INTR_O63
+	CP_IDLE_O63
+	CPUSTATES_O63
+)
 
 type cpuCollector struct {
 	cpu    typedDesc
@@ -52,7 +72,7 @@ func (c *cpuCollector) Update(ch chan<- prometheus.Metric) (err error) {
 	if err != nil {
 		return err
 	}
-	clock := *(*C.struct_clockinfo)(unsafe.Pointer(&clockb[0]))
+	clock := *(*clockinfo)(unsafe.Pointer(&clockb[0]))
 	hz := float64(clock.stathz)
 
 	ncpus, err := unix.SysctlUint32("hw.ncpu")
@@ -60,24 +80,33 @@ func (c *cpuCollector) Update(ch chan<- prometheus.Metric) (err error) {
 		return err
 	}
 
-	var cpTime [][C.CPUSTATES]C.int64_t
+	var cpTime [][CPUSTATES]uint64
 	for i := 0; i < int(ncpus); i++ {
 		cpb, err := unix.SysctlRaw("kern.cp_time2", i)
 		if err != nil && err != unix.ENODEV {
 			return err
 		}
 		if err != unix.ENODEV {
-			cpTime = append(cpTime, *(*[C.CPUSTATES]C.int64_t)(unsafe.Pointer(&cpb[0])))
+			var times [CPUSTATES]uint64
+			for n := 0; n < len(cpb); n += 8 {
+				times[n/8] = *(*uint64)(unsafe.Pointer(&cpb[n]))
+			}
+			if len(cpb)/8 == CPUSTATES_O63 {
+				copy(times[CP_INTR:], times[CP_INTR_O63:])
+				times[CP_SPIN] = 0
+			}
+			cpTime = append(cpTime, times)
 		}
 	}
 
 	for cpu, time := range cpTime {
 		lcpu := strconv.Itoa(cpu)
-		ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_USER])/hz, lcpu, "user")
-		ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_NICE])/hz, lcpu, "nice")
-		ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_SYS])/hz, lcpu, "system")
-		ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_INTR])/hz, lcpu, "interrupt")
-		ch <- c.cpu.mustNewConstMetric(float64(time[C.CP_IDLE])/hz, lcpu, "idle")
+		ch <- c.cpu.mustNewConstMetric(float64(time[CP_USER])/hz, lcpu, "user")
+		ch <- c.cpu.mustNewConstMetric(float64(time[CP_NICE])/hz, lcpu, "nice")
+		ch <- c.cpu.mustNewConstMetric(float64(time[CP_SYS])/hz, lcpu, "system")
+		ch <- c.cpu.mustNewConstMetric(float64(time[CP_SPIN])/hz, lcpu, "spin")
+		ch <- c.cpu.mustNewConstMetric(float64(time[CP_INTR])/hz, lcpu, "interrupt")
+		ch <- c.cpu.mustNewConstMetric(float64(time[CP_IDLE])/hz, lcpu, "idle")
 	}
 	return err
 }
diff --git a/collector/cpu_openbsd_amd64.go b/collector/cpu_openbsd_amd64.go
deleted file mode 100644
index b07d2ca7..00000000
--- a/collector/cpu_openbsd_amd64.go
+++ /dev/null
@@ -1,96 +0,0 @@
-// Copyright 2020 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-//go:build !nocpu
-// +build !nocpu
-
-package collector
-
-import (
-	"strconv"
-	"unsafe"
-
-	"github.com/go-kit/log"
-	"github.com/prometheus/client_golang/prometheus"
-	"golang.org/x/sys/unix"
-)
-
-type clockinfo struct {
-	hz      int32
-	tick    int32
-	tickadj int32
-	stathz  int32
-	profhz  int32
-}
-
-const (
-	CP_USER = iota
-	CP_NICE
-	CP_SYS
-	CP_SPIN
-	CP_INTR
-	CP_IDLE
-	CPUSTATES
-)
-
-type cpuCollector struct {
-	cpu    typedDesc
-	logger log.Logger
-}
-
-func init() {
-	registerCollector("cpu", defaultEnabled, NewCPUCollector)
-}
-
-func NewCPUCollector(logger log.Logger) (Collector, error) {
-	return &cpuCollector{
-		cpu:    typedDesc{nodeCPUSecondsDesc, prometheus.CounterValue},
-		logger: logger,
-	}, nil
-}
-
-func (c *cpuCollector) Update(ch chan<- prometheus.Metric) (err error) {
-	clockb, err := unix.SysctlRaw("kern.clockrate")
-	if err != nil {
-		return err
-	}
-	clock := *(*clockinfo)(unsafe.Pointer(&clockb[0]))
-	hz := float64(clock.stathz)
-
-	ncpus, err := unix.SysctlUint32("hw.ncpu")
-	if err != nil {
-		return err
-	}
-
-	var cpTime [][CPUSTATES]int64
-	for i := 0; i < int(ncpus); i++ {
-		cpb, err := unix.SysctlRaw("kern.cp_time2", i)
-		if err != nil && err != unix.ENODEV {
-			return err
-		}
-		if err != unix.ENODEV {
-			cpTime = append(cpTime, *(*[CPUSTATES]int64)(unsafe.Pointer(&cpb[0])))
-		}
-	}
-
-	for cpu, time := range cpTime {
-		lcpu := strconv.Itoa(cpu)
-		ch <- c.cpu.mustNewConstMetric(float64(time[CP_USER])/hz, lcpu, "user")
-		ch <- c.cpu.mustNewConstMetric(float64(time[CP_NICE])/hz, lcpu, "nice")
-		ch <- c.cpu.mustNewConstMetric(float64(time[CP_SYS])/hz, lcpu, "system")
-		ch <- c.cpu.mustNewConstMetric(float64(time[CP_SPIN])/hz, lcpu, "spin")
-		ch <- c.cpu.mustNewConstMetric(float64(time[CP_INTR])/hz, lcpu, "interrupt")
-		ch <- c.cpu.mustNewConstMetric(float64(time[CP_IDLE])/hz, lcpu, "idle")
-	}
-	return err
-}