diff --git a/Project.toml b/Project.toml
index 5ac41a1..6c391d9 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "PyThermo"
 uuid = "6fae04a5-42e9-4d0c-90a8-26d1a9434b6b"
 authors = ["Alex Ames <alexander.m.ames@gmail.com> and contributors"]
-version = "0.2.1"
+version = "0.2.2"
 
 [deps]
 CondaPkg = "992eb4ea-22a4-4c89-a5bb-47a3300528ab"
diff --git a/src/PyThermo.jl b/src/PyThermo.jl
index da80998..c1ba129 100644
--- a/src/PyThermo.jl
+++ b/src/PyThermo.jl
@@ -152,7 +152,7 @@ function composition_string(mix)
     #     s *= @sprintf("%s: %0.3g, ", species, χ)
     # end
     # s[1:end-2] * "}"
-    join([@sprintf("%0.3g%s %s", 100χ, '%', species) for (species, χ) in zip(species_str, mix.zs)], ", ")
+    join([@sprintf("%0.3g%s %s", 100*pyconvert(Float64, χ), '%', species) for (species, χ) in zip(species_str, mix.zs)], ", ")
 end
 composition_string(s::Species) = s.name
 
diff --git a/test/runtests.jl b/test/runtests.jl
index 3e1d4e2..bd3cec5 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -17,6 +17,9 @@ using Aqua
         ρ_HeAce = HeAce.rho
         @test !isnothing(ρ_HeAce)
         @test isapprox(ρ_HeAce, 0.2747138795604815, rtol=3e-3)
+
+        # test mixture display for the case where mole fractions do not sum to 1
+        @test occursin("Mixture", repr(Mixture(["N2" => 1.0, "Acetone" => 0.1])))
     end
 end