diff --git a/src/tracker/array.jl b/src/tracker/array.jl
index 3d9836d0..00fe4cc4 100644
--- a/src/tracker/array.jl
+++ b/src/tracker/array.jl
@@ -43,6 +43,8 @@ end
 
 Base.print_array(io::IO, x::TrackedArray) = Base.print_array(io, data(x))
 
+Base.copy(x::TrackedArray) = x
+
 Base.setindex!(xs::TrackedArray, v, i...) =
   error("Can't differentiate `setindex!`")
 
diff --git a/src/tracker/scalar.jl b/src/tracker/scalar.jl
index 1b6098fb..e37ee843 100644
--- a/src/tracker/scalar.jl
+++ b/src/tracker/scalar.jl
@@ -23,6 +23,8 @@ end
 
 Base.decompose(x::TrackedReal) = Base.decompose(data(x))
 
+Base.copy(x::TrackedReal) = x
+
 Base.convert(::Type{TrackedReal{T}}, x::TrackedReal{T}) where T = x
 
 Base.convert(::Type{TrackedReal{T}}, x::Real) where T = TrackedReal(convert(T, x))