How come my debounce works once then doesnt work anymore?

My script prints 'event fired' when you click with the tool, and fires the event. I added a debounce into the script, but it only works once, then it doesnt work anymore.

local debounce = false
local tool = script.Parent
local rp = game:GetService("ReplicatedStorage")
local push = rp:WaitForChild("Push")


tool.Equipped:Connect(function(Mouse)
	Mouse.Button1Down:Connect(function()
		if not debounce then
			push:FireServer()
			print'event fired'
			debounce = true
		elseif debounce == true then
			wait(2.5)
			debounce = false
		end
	end)
end)