diff --git a/json-to-l10n/main.go b/json-to-l10n/main.go
index 7270c78..7a4bc01 100644
--- a/json-to-l10n/main.go
+++ b/json-to-l10n/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"code.as/writeas/internal"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -10,7 +11,7 @@ import (
 
 func main() {
 	if len(os.Args) < 3 {
-		outputErr("usage: json-to-l10n filename lang")
+		internal.ErrQuit("usage: json-to-l10n filename lang")
 	}
 
 	file := os.Args[1]
@@ -32,7 +33,7 @@ var phrases` + strings.ToUpper(lang) + ` = map[string]string{
 func parseJSON(filename string) map[string]string {
 	raw, err := ioutil.ReadFile(filename)
 	if err != nil {
-		outputErr("unable to read file: %v", err)
+		internal.ErrQuit("unable to read file: %v", err)
 	}
 
 	r := map[string]string{}
@@ -45,8 +46,3 @@ func parseJSON(filename string) map[string]string {
 	}
 	return r
 }
-
-func outputErr(s string, args ...interface{}) {
-	fmt.Fprintf(os.Stderr, s+"\n", args...)
-	os.Exit(1)
-}
diff --git a/utils.go b/utils.go
new file mode 100644
index 0000000..298ccad
--- /dev/null
+++ b/utils.go
@@ -0,0 +1,11 @@
+package internal
+
+import (
+	"fmt"
+	"os"
+)
+
+func ErrQuit(s string, args ...interface{}) {
+	fmt.Fprintf(os.Stderr, s+"\n", args...)
+	os.Exit(1)
+}