diff --git a/src/MCMCChain.jl b/src/MCMCChain.jl
index 67054180..1678d78d 100644
--- a/src/MCMCChain.jl
+++ b/src/MCMCChain.jl
@@ -4,6 +4,7 @@ import Showoff: showoff
 import StatsBase: autocor, autocov, countmap, counts, describe, predict,
        quantile, sample, sem, summarystats
 import LinearAlgebra: diag
+import Serialization: serialize, deserialize
 
 using RecipesBase
 import RecipesBase: plot
diff --git a/test/diagnostic_tests.jl b/test/diagnostic_tests.jl
index 28c551d8..7888f5b7 100644
--- a/test/diagnostic_tests.jl
+++ b/test/diagnostic_tests.jl
@@ -31,7 +31,7 @@ end
     # do not test the following functions
     # - wrtsp
     # - window2inds (tested above, see getindex)
-    # - 
+    # -
 
     # the following tests only check if the function calls work!
     @test MCMCChain.diag_all(rand(100, 2), :weiss, 1, 1, 1) != nothing
@@ -44,3 +44,16 @@ end
     @test isa(heideldiag(chn[:,1,:]), MCMCChain.ChainSummary)
     @test isa(rafterydiag(chn[:,1,:]), MCMCChain.ChainSummary)
 end
+
+@testset "File IO" begin
+    loc = mktempdir()
+
+    # Serialize and deserialize.
+    write(joinpath(loc, "chain1"), chn)
+    chn2 = read(joinpath(loc, "chain1"), Chains)
+
+    # Test that the values were read correctly.
+    @test chn2.value == chn.value
+    
+    rm(loc; force=true, recursive=true)
+end