diff --git a/sim/gate.lua b/sim/gate.lua
index e07d0ad..c136ef9 100644
--- a/sim/gate.lua
+++ b/sim/gate.lua
@@ -28,7 +28,7 @@ function Gate.setportstate(gate, index, state)
 	if state ~= gate.port_states[index] then
 		local group = gate.port_nets[index]
 		group.state_num = group.state_num - gate.port_states[index] + state
-		gate.ports_states[index] = state
+		gate.port_states[index] = state
 		
 		if ((group.state_num>0) ~= (group.state==1)) and (group.in_queue==0) then
 			Simulation.queuegroup(GSim, group)