diff --git a/server/rpc_server.go b/server/rpc_server.go
index fcef3670..89d60f9e 100644
--- a/server/rpc_server.go
+++ b/server/rpc_server.go
@@ -3,6 +3,7 @@ package server
 import (
 	"context"
 	"fmt"
+	"io"
 	"net"
 	"runtime/debug"
 	"sort"