diff --git a/main.py b/main.py
index 3cc0be8..318c10f 100644
--- a/main.py
+++ b/main.py
@@ -454,7 +454,7 @@ class ArduinoGUI:
                             self.tare_angle()
                         if command[0] == 'u':
                             outCommand = F"command: {command}\n"
-                            selr.arduino.write(outCommand.encode())
+                            self.arduino.write(outCommand.encode())
                             time.sleep(0.1)
                             
                         self.ser.read()