diff --git a/examples/ConvMixer/main.jl b/examples/ConvMixer/main.jl
index d4da2ca946..602ede83c7 100644
--- a/examples/ConvMixer/main.jl
+++ b/examples/ConvMixer/main.jl
@@ -76,7 +76,7 @@ end
 Comonicon.@main function main(; batchsize::Int=512, hidden_dim::Int=256, depth::Int=8,
         patch_size::Int=2, kernel_size::Int=5, weight_decay::Float64=1e-5,
         clip_norm::Bool=false, seed::Int=42, epochs::Int=25, lr_max::Float64=0.01,
-        backend::String="reactant")
+        backend::String="gpu_if_available")
     rng = StableRNG(seed)
 
     if backend == "gpu_if_available"
diff --git a/ext/LuxReactantExt/patches.jl b/ext/LuxReactantExt/patches.jl
index 0af6705e4c..56876d8e02 100644
--- a/ext/LuxReactantExt/patches.jl
+++ b/ext/LuxReactantExt/patches.jl
@@ -5,3 +5,6 @@ LuxOps.xlogx(x::TracedRNumber{Bool}) = zero(x)
 function LuxOps.xlogy(x::TracedRNumber, y::TracedRNumber)
     return invoke(LuxOps.xlogy, Tuple{Number, Number}, float(x), float(y))
 end
+
+# XXX: Use PoolDims once EnzymeJAX supports stablehlo.reduce_window adjoint
+Lux.calculate_pool_dims(g::Lux.GlobalPoolMode, ::TracedRArray) = g