diff --git a/pcf8574_io/PCF85.py b/pcf8574_io/PCF85.py
index bd28566..4baa606 100644
--- a/pcf8574_io/PCF85.py
+++ b/pcf8574_io/PCF85.py
@@ -3,10 +3,10 @@
 
 
 def setup(PCFAdd, smBus, status):
-    if status:
+    if status is not None:
         with SMBus(smBus) as bus:
             bus.write_byte(PCFAdd, status)
-    elif not status:
+    else:
         with SMBus(smBus) as bus:
             bus.write_byte(PCFAdd, 0x00)