diff --git a/collector/edac_linux.go b/collector/edac_linux.go
index 318a118d..8f1f8a15 100644
--- a/collector/edac_linux.go
+++ b/collector/edac_linux.go
@@ -33,14 +33,6 @@ var (
 	edacMemCsrowRE      = regexp.MustCompile(`.*devices/system/edac/mc/mc[0-9]*/csrow([0-9]*)`)
 )
 
-type edacMCMetric struct {
-	metricName    string
-	metricType    prometheus.ValueType
-	metricHelp    string
-	memController string
-	value         float64
-}
-
 type edacCollector struct {
 	ceCount      *prometheus.Desc
 	ueCount      *prometheus.Desc
diff --git a/collector/helper.go b/collector/helper.go
index 60168f25..2bf461e7 100644
--- a/collector/helper.go
+++ b/collector/helper.go
@@ -14,24 +14,11 @@
 package collector
 
 import (
-	"fmt"
 	"io/ioutil"
 	"strconv"
 	"strings"
 )
 
-func splitToInts(str, sep string) ([]int, error) {
-	var ints []int
-	for _, part := range strings.Split(str, sep) {
-		i, err := strconv.Atoi(part)
-		if err != nil {
-			return nil, fmt.Errorf("could not split '%s' because %s is no int: %s", str, part, err)
-		}
-		ints = append(ints, i)
-	}
-	return ints, nil
-}
-
 func readUintFromFile(path string) (uint64, error) {
 	data, err := ioutil.ReadFile(path)
 	if err != nil {
diff --git a/collector/hwmon_linux.go b/collector/hwmon_linux.go
index 1bc33676..c1f4ea4c 100644
--- a/collector/hwmon_linux.go
+++ b/collector/hwmon_linux.go
@@ -29,10 +29,6 @@ import (
 	"github.com/prometheus/common/log"
 )
 
-const (
-	hwMonSubsystem = "hwmon"
-)
-
 var (
 	hwmonInvalidMetricChars = regexp.MustCompile("[^a-z0-9:_]")
 	hwmonFilenameFormat     = regexp.MustCompile(`^(?P<type>[^0-9]+)(?P<id>[0-9]*)?(_(?P<property>.+))?$`)
diff --git a/collector/ipvs_linux_test.go b/collector/ipvs_linux_test.go
index 740b90de..b8f4c72a 100644
--- a/collector/ipvs_linux_test.go
+++ b/collector/ipvs_linux_test.go
@@ -17,7 +17,6 @@ import (
 	"flag"
 	"fmt"
 	"io/ioutil"
-	"net"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -25,99 +24,6 @@ import (
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-	"github.com/prometheus/procfs"
-)
-
-var (
-	expectedIPVSStats = procfs.IPVSStats{
-		Connections:     23765872,
-		IncomingPackets: 3811989221,
-		OutgoingPackets: 0,
-		IncomingBytes:   89991519156915,
-		OutgoingBytes:   0,
-	}
-	expectedIPVSBackendStatuses = []procfs.IPVSBackendStatus{
-		{
-			LocalAddress:  net.ParseIP("192.168.0.22"),
-			LocalPort:     3306,
-			RemoteAddress: net.ParseIP("192.168.82.22"),
-			RemotePort:    3306,
-			Proto:         "TCP",
-			Weight:        100,
-			ActiveConn:    248,
-			InactConn:     2,
-		},
-		{
-			LocalAddress:  net.ParseIP("192.168.0.22"),
-			LocalPort:     3306,
-			RemoteAddress: net.ParseIP("192.168.83.24"),
-			RemotePort:    3306,
-			Proto:         "TCP",
-			Weight:        100,
-			ActiveConn:    248,
-			InactConn:     2,
-		},
-		{
-			LocalAddress:  net.ParseIP("192.168.0.22"),
-			LocalPort:     3306,
-			RemoteAddress: net.ParseIP("192.168.83.21"),
-			RemotePort:    3306,
-			Proto:         "TCP",
-			Weight:        100,
-			ActiveConn:    248,
-			InactConn:     1,
-		},
-		{
-			LocalAddress:  net.ParseIP("192.168.0.57"),
-			LocalPort:     3306,
-			RemoteAddress: net.ParseIP("192.168.84.22"),
-			RemotePort:    3306,
-			Proto:         "TCP",
-			Weight:        0,
-			ActiveConn:    0,
-			InactConn:     0,
-		},
-		{
-			LocalAddress:  net.ParseIP("192.168.0.57"),
-			LocalPort:     3306,
-			RemoteAddress: net.ParseIP("192.168.82.21"),
-			RemotePort:    3306,
-			Proto:         "TCP",
-			Weight:        100,
-			ActiveConn:    1499,
-			InactConn:     0,
-		},
-		{
-			LocalAddress:  net.ParseIP("192.168.0.57"),
-			LocalPort:     3306,
-			RemoteAddress: net.ParseIP("192.168.50.21"),
-			RemotePort:    3306,
-			Proto:         "TCP",
-			Weight:        100,
-			ActiveConn:    1498,
-			InactConn:     0,
-		},
-		{
-			LocalAddress:  net.ParseIP("192.168.0.55"),
-			LocalPort:     3306,
-			RemoteAddress: net.ParseIP("192.168.50.26"),
-			RemotePort:    3306,
-			Proto:         "TCP",
-			Weight:        0,
-			ActiveConn:    0,
-			InactConn:     0,
-		},
-		{
-			LocalAddress:  net.ParseIP("192.168.0.55"),
-			LocalPort:     3306,
-			RemoteAddress: net.ParseIP("192.168.49.32"),
-			RemotePort:    3306,
-			Proto:         "TCP",
-			Weight:        100,
-			ActiveConn:    0,
-			InactConn:     0,
-		},
-	}
 )
 
 func TestIPVSCollector(t *testing.T) {
diff --git a/collector/zfs.go b/collector/zfs.go
index 7b0b85ae..d534c87a 100644
--- a/collector/zfs.go
+++ b/collector/zfs.go
@@ -28,18 +28,11 @@ var errZFSNotAvailable = errors.New("ZFS / ZFS statistics are not available")
 
 type zfsSysctl string
 
-type zfsMetric struct {
-	subsystem string    // The Prometheus subsystem name.
-	name      string    // The Prometheus name of the metric.
-	sysctl    zfsSysctl // The sysctl of the ZFS metric.
-}
-
 func init() {
 	Factories["zfs"] = NewZFSCollector
 }
 
 type zfsCollector struct {
-	zfsMetrics        []zfsMetric
 	linuxProcpathBase string
 	linuxZpoolIoPath  string
 	linuxPathMap      map[string]string
@@ -47,19 +40,19 @@ type zfsCollector struct {
 
 // NewZFSCollector returns a new Collector exposing ZFS statistics.
 func NewZFSCollector() (Collector, error) {
-	var z zfsCollector
-	z.linuxProcpathBase = "spl/kstat/zfs"
-	z.linuxZpoolIoPath = "/*/io"
-	z.linuxPathMap = map[string]string{
-		"zfs_arc":        "arcstats",
-		"zfs_dmu_tx":     "dmu_tx",
-		"zfs_fm":         "fm",
-		"zfs_zfetch":     "zfetchstats",
-		"zfs_vdev_cache": "vdev_cache_stats",
-		"zfs_xuio":       "xuio_stats",
-		"zfs_zil":        "zil",
-	}
-	return &z, nil
+	return &zfsCollector{
+		linuxProcpathBase: "spl/kstat/zfs",
+		linuxZpoolIoPath:  "/*/io",
+		linuxPathMap: map[string]string{
+			"zfs_arc":        "arcstats",
+			"zfs_dmu_tx":     "dmu_tx",
+			"zfs_fm":         "fm",
+			"zfs_zfetch":     "zfetchstats",
+			"zfs_vdev_cache": "vdev_cache_stats",
+			"zfs_xuio":       "xuio_stats",
+			"zfs_zil":        "zil",
+		},
+	}, nil
 }
 
 func (c *zfsCollector) Update(ch chan<- prometheus.Metric) error {