Why does the speed work but the health doesn't?

I made a script that gives extra speed and extra health and theres one problem: the health isn't working. The speed works just fine but for some reason it doesn't give me the extra health.

Here's the script:

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		local humanoid = character:WaitForChild("Humanoid")
		humanoid.WalkSpeed = 24
		humanoid.Health = 1000
	end)
end)