diff --git a/internal/testutil/env_go1_16.go b/internal/testutil/env_go1_16.go
deleted file mode 100644
index 8769a44ab..000000000
--- a/internal/testutil/env_go1_16.go
+++ /dev/null
@@ -1,40 +0,0 @@
-//go:build !go1.17
-// +build !go1.17
-
-package testutil
-
-import (
-	"os"
-	"testing"
-)
-
-// Based on https://github.com/frankban/quicktest/blob/577841610793d24f99e31cc2c0ef3a541fefd7c7/patch.go#L34-L64
-// Licensed under the MIT license
-// Copyright (c) 2017 Canonical Ltd.
-
-// Setenv sets an environment variable to a temporary value for the
-// duration of the test.
-//
-// At the end of the test (see "Deferred execution" in the package docs), the
-// environment variable is returned to its original value.
-func Setenv(t *testing.T, name, val string) {
-	setenv(t, name, val, true)
-}
-
-// setenv sets or unsets an environment variable to a temporary value for the
-// duration of the test
-func setenv(t *testing.T, name, val string, valOK bool) {
-	oldVal, oldOK := os.LookupEnv(name)
-	if valOK {
-		os.Setenv(name, val)
-	} else {
-		os.Unsetenv(name)
-	}
-	t.Cleanup(func() {
-		if oldOK {
-			os.Setenv(name, oldVal)
-		} else {
-			os.Unsetenv(name)
-		}
-	})
-}
diff --git a/internal/testutil/env_go1_17.go b/internal/testutil/env_go1_17.go
deleted file mode 100644
index c7bf1fe3a..000000000
--- a/internal/testutil/env_go1_17.go
+++ /dev/null
@@ -1,18 +0,0 @@
-//go:build go1.17
-// +build go1.17
-
-package testutil
-
-import (
-	"testing"
-)
-
-// Setenv sets an environment variable to a temporary value for the
-// duration of the test.
-//
-// This shim can be removed once support for Go <1.17 is dropped.
-func Setenv(t *testing.T, name, val string) {
-	t.Helper()
-
-	t.Setenv(name, val)
-}
diff --git a/util_test.go b/util_test.go
index cb4e620ad..83d5daaa1 100644
--- a/util_test.go
+++ b/util_test.go
@@ -15,8 +15,6 @@ import (
 	"path/filepath"
 	"reflect"
 	"testing"
-
-	"github.com/spf13/viper/internal/testutil"
 )
 
 func TestCopyAndInsensitiviseMap(t *testing.T) {
@@ -64,8 +62,8 @@ func TestAbsPathify(t *testing.T) {
 	homer := filepath.Join(home, "homer")
 	wd, _ := os.Getwd()
 
-	testutil.Setenv(t, "HOMER_ABSOLUTE_PATH", homer)
-	testutil.Setenv(t, "VAR_WITH_RELATIVE_PATH", "relative")
+	t.Setenv("HOMER_ABSOLUTE_PATH", homer)
+	t.Setenv("VAR_WITH_RELATIVE_PATH", "relative")
 
 	tests := []struct {
 		input  string
diff --git a/viper_test.go b/viper_test.go
index e0bfc57bd..24a371c13 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -620,10 +620,10 @@ func TestEnv(t *testing.T) {
 	BindEnv("id")
 	BindEnv("f", "FOOD", "OLD_FOOD")
 
-	testutil.Setenv(t, "ID", "13")
-	testutil.Setenv(t, "FOOD", "apple")
-	testutil.Setenv(t, "OLD_FOOD", "banana")
-	testutil.Setenv(t, "NAME", "crunk")
+	t.Setenv("ID", "13")
+	t.Setenv("FOOD", "apple")
+	t.Setenv("OLD_FOOD", "banana")
+	t.Setenv("NAME", "crunk")
 
 	assert.Equal(t, "13", Get("id"))
 	assert.Equal(t, "apple", Get("f"))
@@ -639,7 +639,7 @@ func TestMultipleEnv(t *testing.T) {
 
 	BindEnv("f", "FOOD", "OLD_FOOD")
 
-	testutil.Setenv(t, "OLD_FOOD", "banana")
+	t.Setenv("OLD_FOOD", "banana")
 
 	assert.Equal(t, "banana", Get("f"))
 }
@@ -650,7 +650,7 @@ func TestEmptyEnv(t *testing.T) {
 	BindEnv("type") // Empty environment variable
 	BindEnv("name") // Bound, but not set environment variable
 
-	testutil.Setenv(t, "TYPE", "")
+	t.Setenv("TYPE", "")
 
 	assert.Equal(t, "donut", Get("type"))
 	assert.Equal(t, "Cake", Get("name"))
@@ -664,7 +664,7 @@ func TestEmptyEnv_Allowed(t *testing.T) {
 	BindEnv("type") // Empty environment variable
 	BindEnv("name") // Bound, but not set environment variable
 
-	testutil.Setenv(t, "TYPE", "")
+	t.Setenv("TYPE", "")
 
 	assert.Equal(t, "", Get("type"))
 	assert.Equal(t, "Cake", Get("name"))
@@ -677,9 +677,9 @@ func TestEnvPrefix(t *testing.T) {
 	BindEnv("id")
 	BindEnv("f", "FOOD") // not using prefix
 
-	testutil.Setenv(t, "FOO_ID", "13")
-	testutil.Setenv(t, "FOOD", "apple")
-	testutil.Setenv(t, "FOO_NAME", "crunk")
+	t.Setenv("FOO_ID", "13")
+	t.Setenv("FOOD", "apple")
+	t.Setenv("FOO_NAME", "crunk")
 
 	assert.Equal(t, "13", Get("id"))
 	assert.Equal(t, "apple", Get("f"))
@@ -695,7 +695,7 @@ func TestAutoEnv(t *testing.T) {
 
 	AutomaticEnv()
 
-	testutil.Setenv(t, "FOO_BAR", "13")
+	t.Setenv("FOO_BAR", "13")
 
 	assert.Equal(t, "13", Get("foo_bar"))
 }
@@ -706,7 +706,7 @@ func TestAutoEnvWithPrefix(t *testing.T) {
 	AutomaticEnv()
 	SetEnvPrefix("Baz")
 
-	testutil.Setenv(t, "BAZ_BAR", "13")
+	t.Setenv("BAZ_BAR", "13")
 
 	assert.Equal(t, "13", Get("bar"))
 }
@@ -716,7 +716,7 @@ func TestSetEnvKeyReplacer(t *testing.T) {
 
 	AutomaticEnv()
 
-	testutil.Setenv(t, "REFRESH_INTERVAL", "30s")
+	t.Setenv("REFRESH_INTERVAL", "30s")
 
 	replacer := strings.NewReplacer("-", "_")
 	SetEnvKeyReplacer(replacer)
@@ -729,7 +729,7 @@ func TestEnvKeyReplacer(t *testing.T) {
 
 	v.AutomaticEnv()
 
-	testutil.Setenv(t, "REFRESH_INTERVAL", "30s")
+	t.Setenv("REFRESH_INTERVAL", "30s")
 
 	assert.Equal(t, "30s", v.Get("refresh-interval"))
 }
@@ -741,14 +741,14 @@ func TestEnvSubConfig(t *testing.T) {
 
 	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
 
-	testutil.Setenv(t, "CLOTHING_PANTS_SIZE", "small")
+	t.Setenv("CLOTHING_PANTS_SIZE", "small")
 	subv := v.Sub("clothing").Sub("pants")
 	assert.Equal(t, "small", subv.Get("size"))
 
 	// again with EnvPrefix
 	v.SetEnvPrefix("foo") // will be uppercased automatically
 	subWithPrefix := v.Sub("clothing").Sub("pants")
-	testutil.Setenv(t, "FOO_CLOTHING_PANTS_SIZE", "large")
+	t.Setenv("FOO_CLOTHING_PANTS_SIZE", "large")
 	assert.Equal(t, "large", subWithPrefix.Get("size"))
 }
 
@@ -875,8 +875,8 @@ func TestAllKeysWithEnv(t *testing.T) {
 	v.BindEnv("foo.bar")
 	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
 
-	testutil.Setenv(t, "ID", "13")
-	testutil.Setenv(t, "FOO_BAR", "baz")
+	t.Setenv("ID", "13")
+	t.Setenv("FOO_BAR", "baz")
 
 	expectedKeys := sort.StringSlice{"id", "foo.bar"}
 	expectedKeys.Sort()
@@ -1308,7 +1308,7 @@ func TestBoundCaseSensitivity(t *testing.T) {
 
 	BindEnv("eYEs", "TURTLE_EYES")
 
-	testutil.Setenv(t, "TURTLE_EYES", "blue")
+	t.Setenv("TURTLE_EYES", "blue")
 
 	assert.Equal(t, "blue", Get("eyes"))
 
@@ -1492,8 +1492,8 @@ func TestIsSet(t *testing.T) {
 	v.BindEnv("clothing.hat")
 	v.BindEnv("clothing.hats")
 
-	testutil.Setenv(t, "FOO", "bar")
-	testutil.Setenv(t, "CLOTHING_HAT", "bowler")
+	t.Setenv("FOO", "bar")
+	t.Setenv("CLOTHING_HAT", "bowler")
 
 	assert.True(t, v.IsSet("eyes"))           // in the config file
 	assert.True(t, v.IsSet("foo"))            // in the environment