diff --git a/src/lib/array.jl b/src/lib/array.jl
index 8577852ad..489ee2fab 100644
--- a/src/lib/array.jl
+++ b/src/lib/array.jl
@@ -329,19 +329,6 @@ end
 end
 
 # Reductions
-#=
-@adjoint function sum(xs::AbstractArray; dims = :)
-  if dims === (:)
-    sum(xs), Δ -> (Fill(Δ, size(xs)),)
-  else
-    sum(xs, dims = dims), Δ -> (similar(xs) .= Δ,)
-  end
-end
-=#
-
-@adjoint function sum(xs::AbstractArray{Bool}; dims = :)
-  sum(xs, dims = dims), Δ -> (nothing,)
-end
 
 function _pullback(cx::AContext, ::typeof(prod), f, xs::AbstractArray)
   return _pullback(cx, (f, xs) -> prod(f.(xs)), f, xs)
diff --git a/test/lib/array.jl b/test/lib/array.jl
index a3b73aff9..9afe43673 100644
--- a/test/lib/array.jl
+++ b/test/lib/array.jl
@@ -50,8 +50,8 @@ end
 @testset "dictionary comprehension" begin
     d = Dict(1 => 5, 2 => 6)
     g = gradient(d -> sum([v^2 for (_,v) in d]), d)[1]
-    @test g isa Dict{Int, Int}
-    @test g == Dict(1 => 10, 2 => 12)
+    @test g isa Dict{Int, Float64}
+    @test g == Dict(1 => 10.0, 2 => 12.0)
 
 
     w = randn(5)