diff --git a/src/setindex.jl b/src/setindex.jl
index 04203be..ed37881 100644
--- a/src/setindex.jl
+++ b/src/setindex.jl
@@ -24,6 +24,10 @@ Base.@propagate_inbounds function setindex(d0::AbstractDict, v, k)
     return d
 end
 
+function setindex(d::Base.ImmutableDict, v, k)
+    Base.ImmutableDict(d, k => v)
+end
+
 # may be added to Base in https://github.com/JuliaLang/julia/pull/46453
 @inline function setindex(t::Tuple, v, inds::AbstractVector{<:Integer})
     ntuple(length(t)) do i
diff --git a/test/test_setindex.jl b/test/test_setindex.jl
index f8f4bac..fccf4ea 100644
--- a/test/test_setindex.jl
+++ b/test/test_setindex.jl
@@ -43,6 +43,10 @@ end
     @test Accessors.setindex(d, 30, "c") ==ₜ Dict(:a=>1, :b=>2, "c"=>30)
     @test Accessors.setindex(d, 10.0, :a) ==ₜ Dict(:a=>10.0, :b=>2.0)
 
+    d = Base.ImmutableDict(:a => 1, :b => 2)
+    @test @set(d[:a] = 3) == Base.ImmutableDict(:a => 1, :b => 2, :a => 3)
+    @test @set(d[:c] = 3) == Base.ImmutableDict(:a => 1, :b => 2, :c => 3)
+
     nt = (a=1, b='2')
     @test @set(nt[:a] = "abc") == (a="abc", b='2')
     @test @set(nt[1] = "abc") == (a="abc", b='2')