diff --git a/main.py b/main.py
index ceb1cbd..01f190f 100644
--- a/main.py
+++ b/main.py
@@ -446,12 +446,12 @@ class ArduinoGUI:
                     try:
                         command = self.ser.read_all().decode(errors='ignore').strip()
                         print(command)
-                        if command(0) == 'a':
+                        if command[0] == 'a':
                             message = f"{self.current_angle};{self.current_torque};{self.analogInput};{self.currentSetpoint};{self.currentOutput}\n"
                             self.ser.write(message.encode())
-                        if command(0) == 'w':
+                        if command[0] == 'w':
                             self.tare_angle()
-                        if command(0) == 'u':
+                        if command[0] == 'u':
                             time.sleep(5)
                             outCommand = F"{command}\n"
                             self.arduino.write(outCommand.encode())