diff --git a/Mock/GPIO.py b/Mock/GPIO.py
index d0d08fa..4b74957 100644
--- a/Mock/GPIO.py
+++ b/Mock/GPIO.py
@@ -131,10 +131,10 @@ def output(channels, values):
     else:
         if type(values) is list or type(values) is tuple:
             for value in values:
-                logger.info("Output channel : {} with value : {}".format(channel, value))
+                logger.info("Output channel : {} with value : {}".format(channels, value))
         else:
-            logger.info("Output channel : {} with value : {}".format(channel, values))
-        
+            logger.info("Output channel : {} with value : {}".format(channels, values))
+
 
 def input(channel):
     """