diff --git a/common/flag.go b/common/flag.go
index a2bb63f..ccd9eb3 100644
--- a/common/flag.go
+++ b/common/flag.go
@@ -2,6 +2,9 @@ package common
 
 import (
 	"flag"
+	"runtime"
+	"runtime/debug"
+	"time"
 )
 
 func init() {