diff --git a/td.go b/td.go
index 3613e94..15034f7 100644
--- a/td.go
+++ b/td.go
@@ -82,7 +82,7 @@ func getHistory(c *tdlib.Client, chatID64 *int64, senderUserID64 *int64) {
 	}
 
 	if *senderUserID64 != 0 {
-		userDetails, err := c.GetUser(senderUserID64)
+		userDetails, err := c.GetUser(int32(senderUserID64))
 		chatDetails, err := c.GetChat(chat)
 		fmt.Printf("Exporting historic messages for chat %d (%s) from user %d (%s)...\n", chat, chatDetails.Title, *senderUserID64, userDetails.Username)
 	} else {