diff --git a/src/Ansatz/Chain.jl b/src/Ansatz/Chain.jl
index 9a75f8e..3b7ed16 100644
--- a/src/Ansatz/Chain.jl
+++ b/src/Ansatz/Chain.jl
@@ -230,7 +230,7 @@ end
 Tenet.contract(tn::Chain, query::Symbol, args...; kwargs...) = contract!(copy(tn), Val(query), args...; kwargs...)
 Tenet.contract!(tn::Chain, query::Symbol, args...; kwargs...) = contract!(tn, Val(query), args...; kwargs...)
 
-function Tenet.contract!(tn::Chain, ::Val{:between}, site1::Site, site2::Site; direction::Symbol = :left, delete_Λ = false)
+function Tenet.contract!(tn::Chain, ::Val{:between}, site1::Site, site2::Site; direction::Symbol = :left, delete_Λ = true)
     Λᵢ = select(tn, :between, site1, site2)
     Λᵢ === nothing && return tn