diff --git a/b_asic/simulation.py b/b_asic/simulation.py
index a51bf470b01cbaf07be307bdd8472416a95d908f..d3d3aaf6913844f865cc47930802f03b2c6f0d2f 100644
--- a/b_asic/simulation.py
+++ b/b_asic/simulation.py
@@ -3,7 +3,6 @@ B-ASIC Simulation Module.
 TODO: More info.
 """
 
-from signal_flow_graph import OperationId
 from numbers import Number
 from typing import List, Dict
 
@@ -31,7 +30,7 @@ class SimulationState:
 	TODO: More info.
 	"""
 
-	operation_states: Dict[OperationId, OperationState]
+	# operation_states: Dict[OperationId, OperationState]
 	iteration: int
 
 	def __init__(self):