I need assistance now please! Script works in opposite manner than scripted!?

Help?

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I'm making a humanoid's WalkSpeed increase gradually as he or she runs. But instead the walkSpeed increases only when the player doesn't move at all!

local dude = script.Parent

dude.Running:connect(function() if dude.WalkSpeed > 0 then for i = 16,600,1 do dude.WalkSpeed = i wait() end else dude.WalkSpeed = 16 end end)~~~