diff --git a/NS.py b/NS.py
index 722bc72..75880b4 100644
--- a/NS.py
+++ b/NS.py
@@ -229,7 +229,7 @@ class NS(Game, Animation):
         # force to no serial mode.
         if arguments.pi:
             self.get_configuration().set("input", "pi", True)
-            if get_configuration("input", "serial"):
+            if self.get_configuration("input", "serial"):
                 print("Pi mode was requested, so forcing serial (Arduino) mode to off")
                 self.get_configuration().set("input", "serial", False)