diff --git a/Project.toml b/Project.toml
index 4119d62..6f9c9d6 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "InfiniteArrays"
 uuid = "4858937d-0d70-526a-a4dd-2d5cb5dd786c"
-version = "0.15.3"
+version = "0.15.4"
 
 [deps]
 ArrayLayouts = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"
diff --git a/ext/InfiniteArraysBandedMatricesExt.jl b/ext/InfiniteArraysBandedMatricesExt.jl
index ba4aace..5a99048 100644
--- a/ext/InfiniteArraysBandedMatricesExt.jl
+++ b/ext/InfiniteArraysBandedMatricesExt.jl
@@ -5,7 +5,7 @@ using InfiniteArrays.LazyArrays, InfiniteArrays.ArrayLayouts, InfiniteArrays.Fil
 import Base: BroadcastStyle, size, getindex, similar, copy, *, +, -, /, \, materialize!, copyto!, OneTo
 import Base.Broadcast: Broadcasted
 import InfiniteArrays: InfIndexRanges, Infinity, PosInfinity, OneToInf, InfAxes, AbstractInfUnitRange, InfRanges, InfBaseToeplitzLayouts, ConstRowMatrix, PertConstRowMatrix, SymTriPertToeplitz, TriPertToeplitz, ConstRows, PertConstRows, PertTridiagonalToeplitzLayout
-import ArrayLayouts: sub_materialize, MemoryLayout, sublayout, mulreduce, triangularlayout, MatLdivVec, subdiagonaldata, diagonaldata, supdiagonaldata
+import ArrayLayouts: sub_materialize, MemoryLayout, sublayout, mulreduce, triangularlayout, MatLdivVec, subdiagonaldata, diagonaldata, supdiagonaldata, OnesLayout, _copy_oftype
 import LazyArrays: applybroadcaststyle, applylayout, islazy, islazy_layout, simplifiable, AbstractLazyLayout, PaddedColumns, LazyArrayStyle, ApplyLayout, AbstractLazyBandedLayout, ApplyBandedLayout, BroadcastBandedLayout
 import BandedMatrices: _BandedMatrix, AbstractBandedMatrix, banded_similar, BandedMatrix, bandedcolumns, BandedColumns, bandeddata, _default_banded_broadcast
 import FillArrays: AbstractFillMatrix, AbstractFill, getindex_value
@@ -401,6 +401,10 @@ simplifiable(::Mul{<:DiagonalLayout, <:InfToeplitzLayouts}) = Val(true)
 simplifiable(::Mul{<:InfToeplitzLayouts, <:DiagonalLayout}) = Val(true)
 mulreduce(M::Mul{<:DiagonalLayout, <:InfToeplitzLayouts}) = Lmul(M)
 mulreduce(M::Mul{<:InfToeplitzLayouts, <:DiagonalLayout}) = Rmul(M)
+copy(M::Mul{<:DiagonalLayout, <:InfToeplitzLayouts}) = copy(mulreduce(M))
+copy(M::Mul{<:InfToeplitzLayouts, <:DiagonalLayout}) = copy(mulreduce(M))
+copy(M::Mul{<:InfToeplitzLayouts, <:DiagonalLayout{<:OnesLayout}}) = _copy_oftype(M.A, eltype(M))
+copy(M::Mul{<:DiagonalLayout{<:OnesLayout}, <:InfToeplitzLayouts}) = _copy_oftype(M.B, eltype(M))