diff --git a/Project.toml b/Project.toml
index 9ef842f..787b351 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "IntervalSets"
 uuid = "8197267c-284f-5f27-9208-e0e47529a953"
-version = "0.3.2"
+version = "0.3.3"
 
 [deps]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
diff --git a/src/IntervalSets.jl b/src/IntervalSets.jl
index 03734b5..1e2154e 100644
--- a/src/IntervalSets.jl
+++ b/src/IntervalSets.jl
@@ -2,7 +2,7 @@ module IntervalSets
 
 using Base: @pure
 import Base: eltype, convert, show, in, length, isempty, isequal, issubset, ==, hash,
-             union, intersect, minimum, maximum, extrema, range, ⊇
+             union, intersect, minimum, maximum, extrema, range, ⊇, copy
 
 using Statistics
 import Statistics: mean
@@ -19,6 +19,7 @@ A subtype of `Domain{T}` represents a subset of type `T`, that provides `in`.
 """
 abstract type Domain{T} end
 
+copy(d::Domain) = deepcopy(d)
 Base.IteratorSize(::Type{<:Domain}) = Base.SizeUnknown()
 
 
diff --git a/test/runtests.jl b/test/runtests.jl
index a5412df..eff243e 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -31,7 +31,7 @@ struct IncompleteInterval <: AbstractInterval{Int} end
         @test_throws ArgumentError :a .. "b"
         I = 0..3
         @test I === ClosedInterval(0,3) === ClosedInterval{Int}(0,3) ===
-                 Interval(0,3)
+                 Interval(0,3) === copy(I)
         @test string(I) == "0..3"
         @test @inferred(UnitRange(I)) === 0:3
         @test @inferred(range(I)) === 0:3
@@ -210,6 +210,10 @@ struct IncompleteInterval <: AbstractInterval{Int} end
 
         @test promote_type(Interval{:closed,:open,Float64}, Interval{:closed,:open,Int}) ===
                         Interval{:closed,:open,Float64}
+
+        J = BigFloat(1)..2                        
+        @test copy(J) == J
+        @test copy(J) !== J
     end