diff --git a/src/PCHIPInterpolation.jl b/src/PCHIPInterpolation.jl
index 7bedbb3..3ab7687 100644
--- a/src/PCHIPInterpolation.jl
+++ b/src/PCHIPInterpolation.jl
@@ -57,8 +57,6 @@ struct Interpolator{Xs,Ys,Ds}
         length(eachindex(xs, ys)) ≥ 2 || throw(ArgumentError("inputs must have at least 2 elements"))
         _is_strictly_increasing(xs) || throw(ArgumentError("xs must be strictly increasing"))
 
-        xs = deepcopy(xs)
-        ys = deepcopy(ys)
         ds = _pchip_ds_scipy(xs, ys)
 
         new{typeof(xs),typeof(ys),typeof(ds)}(xs, ys, ds)
@@ -68,10 +66,6 @@ struct Interpolator{Xs,Ys,Ds}
         length(eachindex(xs, ys, ds)) ≥ 2 || throw(ArgumentError("inputs must have at least 2 elements"))
         _is_strictly_increasing(xs) || throw(ArgumentError("xs must be strictly increasing"))
 
-        xs = deepcopy(xs)
-        ys = deepcopy(ys)
-        ds = deepcopy(ds)
-
         new{typeof(xs),typeof(ys),typeof(ds)}(xs, ys, ds)
     end
 end
diff --git a/test/runtests.jl b/test/runtests.jl
index 5691d8a..cf74736 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -343,17 +343,6 @@ end
             @test itp(1) == 1
         end
 
-        @testset "gh-11" begin
-            # Regression test for https://github.com/gerlero/PCHIPInterpolation.jl/issues/11
-            v = [1, 2, 3]
-            itp = Interpolator(v, v)
-            xs = copy(itp.xs)
-            ys = copy(itp.ys)
-            v .= -1
-            @test itp.xs == xs
-            @test itp.ys == ys
-        end
-
         @testset "gh-31" begin
             # Test correctness of _pchip_ds_scipy implementation following https://github.com/gerlero/PCHIPInterpolation.jl/issues/31
             # Tests that the interpolated values are the same as SciPy