diff --git a/b_asic/operation.py b/b_asic/operation.py
index 3f1abe8154d5d1f8a16fbad9b16d157f3c025758..d1a820fbe49592e5545ff5624dc5fc121c77b71f 100644
--- a/b_asic/operation.py
+++ b/b_asic/operation.py
@@ -6,7 +6,6 @@ TODO: More info.
 from b_asic.signal import Signal
 from b_asic.port import SignalSourceProvider, InputPort, OutputPort
 from b_asic.graph_component import GraphComponent, AbstractGraphComponent, Name
-import re
 import itertools as it
 from math import trunc
 import collections