diff --git a/cpu_darwin.go b/cpu_darwin.go
index 81705fd8..abc8dc95 100644
--- a/cpu_darwin.go
+++ b/cpu_darwin.go
@@ -79,6 +79,10 @@ func CPUInfo() ([]CPUInfoStat, error) {
 	for _, line := range strings.Split(string(out), "\n") {
 		values := strings.Fields(line)
 
+		t, err := strconv.ParseInt(values[1], 10, 32)
+		if err != nil {
+			return ret, err
+		}
 		if strings.HasPrefix(line, "machdep.cpu.brand_string") {
 			c.ModelName = strings.Join(values[1:], " ")
 		} else if strings.HasPrefix(line, "machdep.cpu.family") {
@@ -86,12 +90,7 @@ func CPUInfo() ([]CPUInfoStat, error) {
 		} else if strings.HasPrefix(line, "machdep.cpu.model") {
 			c.Model = values[1]
 		} else if strings.HasPrefix(line, "machdep.cpu.stepping") {
-			t, err := strconv.ParseInt(values[1], 10, 32)
-			if err != nil {
-				return ret, err
-			}
 			c.Stepping = int32(t)
-
 		} else if strings.HasPrefix(line, "machdep.cpu.features") {
 			for _, v := range values[1:] {
 				c.Flags = append(c.Flags, strings.ToLower(v))
@@ -105,18 +104,9 @@ func CPUInfo() ([]CPUInfoStat, error) {
 				c.Flags = append(c.Flags, strings.ToLower(v))
 			}
 		} else if strings.HasPrefix(line, "machdep.cpu.core_count") {
-			t, err := strconv.ParseInt(values[1], 10, 32)
-			if err != nil {
-				return ret, err
-			}
-			c.Cores = t
+			c.Cores = int32(t)
 		} else if strings.HasPrefix(line, "machdep.cpu.cache.size") {
-			t, err := strconv.ParseInt(values[1], 10, 32)
-			if err != nil {
-				return ret, err
-			}
-
-			c.CacheSize = t
+			c.CacheSize = int32(t)
 		} else if strings.HasPrefix(line, "machdep.cpu.vendor") {
 			c.VendorID = values[1]
 		}
diff --git a/host_darwin.go b/host_darwin.go
index db09f8c8..c666dea3 100644
--- a/host_darwin.go
+++ b/host_darwin.go
@@ -60,7 +60,11 @@ func HostInfo() (*HostInfoStat, error) {
 	if err == nil {
 		// ex: { sec = 1392261637, usec = 627534 } Thu Feb 13 12:20:37 2014
 		v := strings.Replace(values[2], ",", "", 1)
-		ret.Uptime = mustParseUint64(v)
+		t, err := strconv.ParseUint(v, 10, 64)
+		if err != nil {
+			return ret, err
+		}
+		ret.Uptime = t
 	}
 
 	return ret, nil
diff --git a/net_darwin.go b/net_darwin.go
index e24c6adc..d65e116f 100644
--- a/net_darwin.go
+++ b/net_darwin.go
@@ -4,6 +4,7 @@ package gopsutil
 
 import (
 	"os/exec"
+	"strconv"
 	"strings"
 )
 
@@ -19,6 +20,7 @@ func NetIOCounters(pernic bool) ([]NetIOCountersStat, error) {
 	for _, line := range lines {
 		values := strings.Fields(line)
 		if len(values) < 1 || values[0] == "Name" {
+			// skip first line
 			continue
 		}
 		base := 1
@@ -27,18 +29,30 @@ func NetIOCounters(pernic bool) ([]NetIOCountersStat, error) {
 			base = 0
 		}
 
+		parsed := make([]uint64, 0, 3)
+		vv := []string{
+			values[base+3], // PacketsRecv
+			values[base+4], // Errin
+			values[base+5], // Dropin
+		}
+		for _, target := range vv {
+			if target == "-" {
+				parsed = append(parsed, 0)
+				continue
+			}
+
+			t, err := strconv.ParseUint(target, 10, 64)
+			if err != nil {
+				return nil, err
+			}
+			parsed = append(parsed, t)
+		}
+
 		n := NetIOCountersStat{
 			Name:        values[0],
-			PacketsRecv: mustParseUint64(values[base+3]),
-			Errin:       mustParseUint64(values[base+4]),
-			Dropin:      mustParseUint64(values[base+5]),
-			/*
-				BytesRecv:   mustParseUint64(values[base+6]),
-				PacketsSent: mustParseUint64(values[base+7]),
-				Errout:      mustParseUint64(values[base+8]),
-				BytesSent:   mustParseUint64(values[base+9]),
-				Dropout:     mustParseUint64(values[base+11]),
-			*/
+			PacketsRecv: parsed[0],
+			Errin:       parsed[1],
+			Dropin:      parsed[2],
 		}
 		ret = append(ret, n)
 	}