diff --git a/lib/flagutil/array.go b/lib/flagutil/array.go
deleted file mode 100644
index d8b55c2fe..000000000
--- a/lib/flagutil/array.go
+++ /dev/null
@@ -1,18 +0,0 @@
-package flagutil
-
-import "strings"
-
-// Array holds an array of flag values
-type Array []string
-
-// String implements flag.Value interface
-func (a *Array) String() string {
-	return strings.Join(*a, ",")
-}
-
-// Set implements flag.Value interface
-func (a *Array) Set(value string) error {
-	values := strings.Split(value, ",")
-	*a = append(*a, values...)
-	return nil
-}
diff --git a/lib/flagutil/array_test.go b/lib/flagutil/array_test.go
deleted file mode 100644
index 835d9cfa5..000000000
--- a/lib/flagutil/array_test.go
+++ /dev/null
@@ -1,34 +0,0 @@
-package flagutil
-
-import (
-	"flag"
-	"os"
-	"testing"
-)
-
-var fooFlag Array
-
-func init() {
-	os.Args = append(os.Args, "--fooFlag=foo", "--fooFlag=bar")
-	flag.Var(&fooFlag, "fooFlag", "test")
-}
-
-func TestMain(m *testing.M) {
-	flag.Parse()
-	os.Exit(m.Run())
-}
-
-func TestArray(t *testing.T) {
-	expected := map[string]struct{}{
-		"foo": {},
-		"bar": {},
-	}
-	if len(expected) != len(fooFlag) {
-		t.Errorf("len array flag (%d) is not equal to %d", len(fooFlag), len(expected))
-	}
-	for _, i := range fooFlag {
-		if _, ok := expected[i]; !ok {
-			t.Errorf("unexpected item in array %v", i)
-		}
-	}
-}