diff --git a/src/combinators/hierarchical.jl b/src/combinators/hierarchical.jl
index 0a2b1909..2499e445 100644
--- a/src/combinators/hierarchical.jl
+++ b/src/combinators/hierarchical.jl
@@ -77,7 +77,7 @@ _autoflat_combine_variates(a::Tuple, b::Tuple) = (a, b)
 _autoflat_combine_variates(a::NamedTuple, b::NamedTuple) = merge(a, b)
 
 
-_local_productmeasure(::NoFlatten, μ1, μ2) = productmeasure(μ1, μ2)
+_local_productmeasure(::NoFlatten, μ1, μ2) = productmeasure((μ1, μ2))
 
 # TODO: _local_productmeasure(::AutoFlatten, μ1, μ2) = productmeasure(μ1, μ2)
 # Needs a FlatProductMeasure type.