diff --git a/src/destructure.jl b/src/destructure.jl
index 2b91983d..d8eb0378 100644
--- a/src/destructure.jl
+++ b/src/destructure.jl
@@ -130,13 +130,20 @@ function _grad!(x, dx, off, flat::AbstractVector)
   foreach((xᵢ, dxᵢ, oᵢ) -> _grad!(xᵢ, dxᵢ, oᵢ, flat), x′, dx′, off′)
   flat
 end
-function _grad!(x, dx, off::Integer, flat::AbstractVector)
+function _grad!(x::T, dx::T, off::Integer, flat::AbstractVector) where T
   @views flat[off .+ (1:length(x))] .+= vec(dx)  # must visit all tied nodes
   flat
 end
 _grad!(x, dx::Zero, off, flat::AbstractVector) = dx
 _grad!(x, dx::Zero, off::Integer, flat::AbstractVector) = dx  # ambiguity
 
+function _grad!(x::T, dx::S, off::Integer, flat::AbstractVector) where {T, S}
+  flat = similar(dx, length(flat))
+  @views flat[off .+ (1:length(x))] .+= vec(dx)  # must visit all tied nodes
+  flat
+end
+
+
 # These are only needed for 2nd derivatives:
 function ChainRulesCore.rrule(::typeof(_grad!), x, dx, off, flat)
   @warn "second derivatives of Restructure may not work yet, sorry!" maxlog=3