diff --git a/sys/system.js b/sys/system.js
index b1fddcc..13ccc6f 100644
--- a/sys/system.js
+++ b/sys/system.js
@@ -31,14 +31,14 @@ async function readLine(on_key=(key, ctrl, alt, shift, content, pos) => [content
                 if (pos >= 1) {
                     content = content.slice(0, pos - 1) + content.slice(pos)
                     pos -= 1
-                    setTerminal(start_terminal.substring(0, terminal_text.length-length) + content)
+                    setTerminal(start_terminal + content)
                     let cursor = getCursor()
                     setCursor(cursor[0]-1, cursor[1])
                     updateTerminalWOCursor()
                 }
             } else if (event.key == "Delete") {
                 content = content.slice(0, pos) + content.slice(pos + 1)
-                setTerminal(start_terminal.substring(0, terminal_text.length-length) + content)
+                setTerminal(start_terminal + content)
                 updateTerminalWOCursor()
             } else if (event.key == "ArrowLeft") {
                 let cursor = getCursor()