diff --git a/simulator/serial.py b/simulator/serial.py
index 5ad2b6c..5307166 100644
--- a/simulator/serial.py
+++ b/simulator/serial.py
@@ -36,5 +36,5 @@ class Serial:
 			return "".encode()
 		raise Exception("Test Serial Exception")
 
-	def reset_input_buffer():
+	def reset_input_buffer(self):
 		pass