diff --git a/en/07.4.md b/en/07.4.md
index 7dcf907c..a4883dcd 100644
--- a/en/07.4.md
+++ b/en/07.4.md
@@ -346,6 +346,7 @@ import (
 	"os"
 	"io/ioutil"
 	"text/template"
+	"strings"
 )
 
 var templates *template.Template