diff --git a/Project.toml b/Project.toml
index c7a26f0..9a88e75 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "BoundedStreams"
 uuid = "819c7365-da23-433e-86d1-f9a07e67aad6"
 authors = ["Klaus Crusius <klaus.crusius@web.de>"]
-version = "0.3"
+version = "0.3.1"
 
 [compat]
 julia = "1.3"
diff --git a/src/BoundedStreams.jl b/src/BoundedStreams.jl
index d1d15fe..4580afe 100644
--- a/src/BoundedStreams.jl
+++ b/src/BoundedStreams.jl
@@ -27,10 +27,11 @@ struct BoundedInputStream{T} <: BoundedStream{T}
     offset::Int
     length::Int
     close::Int
+    isopen::Bool
     function BoundedInputStream(io::T, nb::Integer;
                                 offset::Integer=0, close::Integer=nb) where T
 
-        new{T}(io, initposition!(io, offset), nb, close)
+        new{T}(io, initposition!(io, offset), nb, close, true)
     end
 end
 
@@ -54,10 +55,11 @@ struct BoundedOutputStream{T} <: BoundedStream{T}
     offset::Int
     length::Int
     close::Int
+    isopen::Bool
     function BoundedOutputStream(io::T, nb::Integer;
                                 offset::Integer=0, close::Integer=nb) where T
 
-        new{T}(io, initposition!(io, offset), nb, close)
+        new{T}(io, initposition!(io, offset), nb, close, true)
     end
 end
 
@@ -99,6 +101,7 @@ function Base.close(io::BoundedStream)
             seek(source, q)
         end
     end
+    io.isopen = false
     nothing
 end
 
@@ -117,6 +120,7 @@ function Base.seek(io::BoundedStream, nb::Integer)
 end
 Base.seekend(io::BoundedStream) = seek(io, io.length)
 
+Base.isopen(io::BoundedStream) = io.isopen
 Base.isreadable(io::BoundedStream) = io isa BoundedInputStream
 Base.iswritable(io::BoundedStream) = io isa BoundedOutputStream
 Base.mark(io::BoundedStream) = mark(io.source)
diff --git a/test/runtests.jl b/test/runtests.jl
index c219777..3b9cd83 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -22,7 +22,9 @@ file = joinpath(mkpath(abspath(@__FILE__, "..", "data")), "test.dat")
     @test reset(is) == 5
     @test position(is) == 5
     @test bytesavailable(is) == 95
+    @test isopen(is) == true
     close(is)
+    @test isopen(is) == false
     @test bytesavailable(is) == 0
     @test position(io) == 100
     close(io)