diff --git a/base/reducedim.jl b/base/reducedim.jl
index fe3adef035dec..a932e826bd10c 100644
--- a/base/reducedim.jl
+++ b/base/reducedim.jl
@@ -651,6 +651,8 @@ for (fname, _fname, op) in [(:sum,     :_sum,     :add_sum), (:prod,    :_prod,
         # User-facing methods with keyword arguments
         @inline ($fname)(a::AbstractArray; dims=:) = ($_fname)(a, dims)
         @inline ($fname)(f, a::AbstractArray; dims=:) = ($_fname)(f, a, dims)
+        @inline ($fname)(f, a::AbstractArray, b::AbstractArray; dims=:) =
+            ($_fname)(((a,b),)->f(a,b), zip(a,b), dims)
 
         # Underlying implementations using dispatch
         ($_fname)(a, ::Colon) = ($_fname)(identity, a, :)