diff --git a/pkg/osutil/osutil.go b/pkg/osutil/osutil.go
index cbf96e2e0..c1405db70 100644
--- a/pkg/osutil/osutil.go
+++ b/pkg/osutil/osutil.go
@@ -15,27 +15,7 @@
 // Package osutil implements operating system-related utility functions.
 package osutil
 
-import (
-	"os"
-	"strings"
-)
-
 var (
 	// support to override setting SIG_DFL so tests don't terminate early
 	setDflSignal = dflSignal
 )
-
-func Unsetenv(key string) error {
-	envs := os.Environ()
-	os.Clearenv()
-	for _, e := range envs {
-		strs := strings.SplitN(e, "=", 2)
-		if strs[0] == key {
-			continue
-		}
-		if err := os.Setenv(strs[0], strs[1]); err != nil {
-			return err
-		}
-	}
-	return nil
-}
diff --git a/pkg/osutil/osutil_test.go b/pkg/osutil/osutil_test.go
index 322d2770c..28fcc7288 100644
--- a/pkg/osutil/osutil_test.go
+++ b/pkg/osutil/osutil_test.go
@@ -17,7 +17,6 @@ package osutil
 import (
 	"os"
 	"os/signal"
-	"reflect"
 	"syscall"
 	"testing"
 	"time"
@@ -27,30 +26,6 @@ import (
 
 func init() { setDflSignal = func(syscall.Signal) {} }
 
-func TestUnsetenv(t *testing.T) {
-	tests := []string{
-		"data",
-		"space data",
-		"equal=data",
-	}
-	for i, tt := range tests {
-		key := "ETCD_UNSETENV_TEST"
-		if os.Getenv(key) != "" {
-			t.Fatalf("#%d: cannot get empty %s", i, key)
-		}
-		env := os.Environ()
-		if err := os.Setenv(key, tt); err != nil {
-			t.Fatalf("#%d: cannot set %s: %v", i, key, err)
-		}
-		if err := Unsetenv(key); err != nil {
-			t.Errorf("#%d: unsetenv %s error: %v", i, key, err)
-		}
-		if g := os.Environ(); !reflect.DeepEqual(g, env) {
-			t.Errorf("#%d: env = %+v, want %+v", i, g, env)
-		}
-	}
-}
-
 func waitSig(t *testing.T, c <-chan os.Signal, sig os.Signal) {
 	select {
 	case s := <-c: