diff --git a/sim/simulation.lua b/sim/simulation.lua
index 31cbd4d..7920e03 100644
--- a/sim/simulation.lua
+++ b/sim/simulation.lua
@@ -349,7 +349,7 @@ function Simulation.ticklogic(sim)
 		sim.tickqueue[sim.current_tick] = nil
 	end
 	
-	for i = 1, sim.num_gatequeue-1 do
+	for i = 0, sim.num_gatequeue-1 do
 		local cgate = sim.gatequeue[i]
 		local gate = Simulation.gate_from_cgate(sim, cgate)
 		gate.logic(gate)