diff --git a/rules.go b/rules.go
index 82c1555..1f96495 100644
--- a/rules.go
+++ b/rules.go
@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"log"
 	"regexp"
 )