diff --git a/Project.toml b/Project.toml
index 0f9a0a2..a22c860 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "PseudoBooleanOptimization"
 uuid = "c8fa9a04-bc42-452d-8558-dc51757be744"
 authors = ["pedromxavier <pedrox@cos.ufrj.br>"]
-version = "0.2.0"
+version = "0.2.1"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
diff --git a/src/library/function/abstract.jl b/src/library/function/abstract.jl
index d764ee1..49c2b47 100644
--- a/src/library/function/abstract.jl
+++ b/src/library/function/abstract.jl
@@ -75,7 +75,7 @@ function Base.show(io::IO, ::MIME"text/plain", f::AbstractPBF{V,T}) where {V,T}
         return nothing
     end
 
-    terms = sort!(map(((ω, c)::Pair) -> (sort!(collect(ω)) => c), pairs(f)); by=first, lt=varlt)
+    terms = sort!(map(((ω, c)::Pair) -> (sort!(collect(ω); alg=InsertionSort, lt=varlt) => c), pairs(f)); by=first, lt=varlt)
 
     for (i, (ω, c)) in enumerate(terms)
         if i > 1