diff --git a/internal/log/log.go b/internal/log/log.go
index 7976bcf..778fdab 100644
--- a/internal/log/log.go
+++ b/internal/log/log.go
@@ -6,11 +6,14 @@
 package log
 
 import (
+	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"log"
 	"os"
+	"os/exec"
 	"reflect"
 	"strings"
 	"sync"
@@ -280,3 +283,13 @@
 	log.Printf("Error: %s is invalid LogLevel. Possible values are [debug, info, warning, error, fatal]", v)
 	return logging.Default
 }
+
+// IncludeStderr includes the stderr with an *exec.ExitError.
+// If err is not an *exec.ExitError, it returns err.Error().
+func IncludeStderr(err error) string {
+	var eerr *exec.ExitError
+	if errors.As(err, &eerr) {
+		return fmt.Sprintf("%v: %s", eerr, bytes.TrimSpace(eerr.Stderr))
+	}
+	return err.Error()
+}
diff --git a/internal/sandbox/sandbox_test.go b/internal/sandbox/sandbox_test.go
index d88d652..b396652 100644
--- a/internal/sandbox/sandbox_test.go
+++ b/internal/sandbox/sandbox_test.go
@@ -12,7 +12,7 @@
 	"strings"
 	"testing"
 
-	"golang.org/x/pkgsite-metrics/internal"
+	"golang.org/x/pkgsite-metrics/internal/log"
 )
 
 // These tests require a minimal bundle, in testdata/bundle.
@@ -32,7 +32,7 @@
 	t.Run("printargs", func(t *testing.T) {
 		out, err := sb.Run(ctx, "/printargs", "a", "b")
 		if err != nil {
-			t.Fatal(internal.IncludeStderr(err))
+			t.Fatal(log.IncludeStderr(err))
 		}
 
 		want := `args:
diff --git a/internal/util.go b/internal/util.go
deleted file mode 100644
index 15395a6..0000000
--- a/internal/util.go
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright 2022 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package internal
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"os/exec"
-)
-
-// IncludeStderr includes the stderr with an *exec.ExitError.
-// If err is not an *exec.ExitError, it returns err.Error().
-func IncludeStderr(err error) string {
-	var eerr *exec.ExitError
-	if errors.As(err, &eerr) {
-		return fmt.Sprintf("%v: %s", eerr, bytes.TrimSpace(eerr.Stderr))
-	}
-	return err.Error()
-}