diff --git a/src/kyupy/logic_sim.py b/src/kyupy/logic_sim.py
index a8bc535..a830e95 100644
--- a/src/kyupy/logic_sim.py
+++ b/src/kyupy/logic_sim.py
@@ -291,7 +291,7 @@ class LogicSim(SimOps):
     #     logic.bp_or(outputs[0], self.tmp[0], inputs[2])
     #     logic.bp_not(outputs[0], outputs[0])
 
-@numba.njit()
+@numba.njit
 def _prop_cpu(ops, vat, c):
     for op, o0, i0, i1, i2, i3 in ops:
         o0, i0, i1, i2, i3 = [vat[x,0] for x in (o0, i0, i1, i2, i3)]