diff --git a/mocha/core/InstanceKey.py b/mocha/core/InstanceKey.py
index 3654905..7786350 100644
--- a/mocha/core/InstanceKey.py
+++ b/mocha/core/InstanceKey.py
@@ -23,4 +23,7 @@ class InstanceKey():
 	def __str__(self):
 
 		return str(self.get_class_index()) + '$' + str(self.get_instance_index())
-	
\ No newline at end of file
+
+	def to_tuple(self):
+		return (self.__class_id, self.__inst_id)
+