diff --git a/intercom.py b/intercom.py
index 8e4723a..bdd4285 100644
--- a/intercom.py
+++ b/intercom.py
@@ -159,7 +159,7 @@ try:
     while True:
         for _station in stations:
             # new_input_state = GPIO.input(_station['button'])
-            new_input_state = station['btn'].is_pressed
+            new_input_state = _station['btn'].is_pressed
             # Al pulsar el interruptor cambia el estado.
             elapsed_time = time.clock_gettime(time.CLOCK_MONOTONIC) - _station['button state changed time']
             if new_input_state != _station['old button state'] and elapsed_time > 0.2: