diff --git a/redstone_toggle b/redstone_toggle
index 89eb261..9b57ad5 100644
--- a/redstone_toggle
+++ b/redstone_toggle
@@ -64,7 +64,7 @@ function lever_input()
     local lever_state = redstone.getInput("top")
     while true do
         local new_lever_state = redstone.getInput("top")
-        if new_lever_state != lever_state then
+        if new_lever_state ~= lever_state then
             lever_state = new_lever_state
             local output_state = not redstone.getInput("back")
             redstone.setOutput("back", output_state)