diff --git a/src/Ansatz/Chain.jl b/src/Ansatz/Chain.jl
index bc7332728..72d80b237 100644
--- a/src/Ansatz/Chain.jl
+++ b/src/Ansatz/Chain.jl
@@ -393,7 +393,7 @@ function truncate!(qtn::Chain, bond; threshold::Union{Nothing,Real}=nothing, max
 
     # remove 0s from spectrum
     if isnothing(threshold)
-        threshold = 1e-16
+        threshold = wrap_eps(eltype(qtn))
     end
 
     filter!(extent) do i
diff --git a/src/Helpers.jl b/src/Helpers.jl
index e819032b0..05be5be6f 100644
--- a/src/Helpers.jl
+++ b/src/Helpers.jl
@@ -44,3 +44,8 @@ function nextindex!(gen::IndexCounter)
     return letter(Threads.atomic_add!(gen.counter, 1))
 end
 resetindex!(gen::IndexCounter) = letter(Threads.atomic_xchg!(gen.counter, 1))
+
+# eps wrapper so it handles Complex numbers
+# if is Complex, extract the parametric type and get the eps of that
+wrap_eps(x) = eps(x)
+wrap_eps(::Type{Complex{T}}) where {T} = eps(T)