diff --git a/src/DAT/broadcast.jl b/src/DAT/broadcast.jl
index 4ab4e94c..4b64d36e 100644
--- a/src/DAT/broadcast.jl
+++ b/src/DAT/broadcast.jl
@@ -17,14 +17,10 @@ function Base.materialize(bc::Broadcast.Broadcasted{XStyle})
     args2 = map(arg -> arg isa Broadcast.Broadcasted ? Base.materialize(arg) : arg, bc.args)
     args2 = map(to_yax, args2)
     # determine output type by calling `eltype` on a dummy function call
-    dummy_args = map(a -> first(a.data), args2)
-    outtype = typeof(bc.f(dummy_args...))
+    intypes = (eltype.(args2)...,)
+    @debug intypes
+    outtypes = Base.return_types(bc.f, intypes)
+    outtype = Base.promote_type(outtypes...)
+    @debug outtype
     return xmap(XFunction(bc.f; inplace=false), args2..., output=XOutput(; outtype))
-end
-function Base.materialize!(bc::Broadcast.Broadcasted{XStyle})
-    args2 = map(arg -> arg isa Broadcast.Broadcasted ? Base.materialize(arg) : arg, bc.args)
-    args2 = map(to_yax, args2)
-    dummy_args = map(a -> first(a.data), args2)
-    outtype = typeof(bc.f(dummy_args...))
-    return xmap(XFunction(bc.f; inplace=true), args2..., output=XOutput(; outtype))
 end
\ No newline at end of file
diff --git a/test/DAT/broadcast.jl b/test/DAT/broadcast.jl
index 93d1074d..4a0214b6 100644
--- a/test/DAT/broadcast.jl
+++ b/test/DAT/broadcast.jl
@@ -60,4 +60,12 @@ a, b, c = sample_arrays()
     xscalar = a .* 3 .+ 1
     @test all(xscalar[:] .== 4.0)
     @test isa(a .+ b, YAXArray)
+end
+
+@testset "missing handling" begin
+    am = YAXArray([missing 1 ; 1 2])
+    aeq = am .== am
+    @test eltype(aeq) == Union{Missing, Bool}
+    @test ismissing(aeq[1,1])
+    @test aeq[1,2]
 end
\ No newline at end of file
diff --git a/test/runtests.jl b/test/runtests.jl
index dd8f12bd..e9b26177 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -17,6 +17,7 @@ include("Datasets/datasets.jl")
 
 include("DAT/PickAxisArray.jl")
 include("DAT/MovingWindow.jl")
+include("DAT/broadcast.jl")
 include("DAT/tablestats.jl")
 include("DAT/mapcube.jl")
 include("DAT/xmap.jl")